WO2014087463A1 - Display device, information processing device, and method for controlling display device - Google Patents

Display device, information processing device, and method for controlling display device Download PDF

Info

Publication number
WO2014087463A1
WO2014087463A1 PCT/JP2012/081256 JP2012081256W WO2014087463A1 WO 2014087463 A1 WO2014087463 A1 WO 2014087463A1 JP 2012081256 W JP2012081256 W JP 2012081256W WO 2014087463 A1 WO2014087463 A1 WO 2014087463A1
Authority
WO
WIPO (PCT)
Prior art keywords
light source
image
video signal
power
display device
Prior art date
Application number
PCT/JP2012/081256
Other languages
French (fr)
Japanese (ja)
Inventor
堀　宏昭
Original Assignee
Ｎｅｃディスプレイソリューションズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ｎｅｃディスプレイソリューションズ株式会社 filed Critical Ｎｅｃディスプレイソリューションズ株式会社
Priority to PCT/JP2012/081256 priority Critical patent/WO2014087463A1/en
Publication of WO2014087463A1 publication Critical patent/WO2014087463A1/en

Links

Images

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/10—Special adaptations of display systems for operation with variable images
    • G09G2320/103—Detection of image changes, e.g. determination of an index representative of the image change
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3433—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
    • G09G3/346—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on modulation of the reflection angle, e.g. micromirrors

Definitions

  • the present invention relates to a display device, an information processing device, and a display device control method.
  • a display device that displays an image using light emitted from a light source such as a projector or a liquid crystal display device
  • a light source such as a projector or a liquid crystal display device
  • most of the power consumption is the power of the light source.
  • it is effective to reduce the power supplied to the light source.
  • the displayed image becomes dark, and it becomes difficult for the user to visually recognize the image.
  • Patent Document 1 discloses a projector device that changes the power supplied to the light source in accordance with the luminance of the video signal. This projector device reduces the power supplied to the light source when the luminance of the video signal is low, and increases the luminance of the video signal in accordance with the reduction rate without changing the brightness of the displayed image. Power consumption is reduced.
  • Patent Document 1 has a problem that power consumption cannot be reduced because power supplied to the light source is not reduced when the luminance of the video signal continues to be high.
  • a slide with a bright pattern superimposed on a white background is often displayed.
  • the state in which the luminance of the video signal is high continues, and the power supplied to the light source is not reduced.
  • An object of the present invention is to provide a display device, an information processing device, and a display device control method capable of reducing power consumption even when the luminance of a video signal continues to be high.
  • a display device receives a light source, a light source driving unit that supplies power to the light source and emits light from the light source, and a display element that displays an image using light emitted from the light source.
  • a video signal processing unit that generates an image to be displayed by the display element in response to the received video signal, and a change in the image output by the video signal processing unit. Based on the detection result, the light source driving unit And a controller that adjusts the power supplied to the light source.
  • An information processing apparatus is a display device having a light source, a light source driving unit that supplies power to the light source to emit light from the light source, and a display element that displays an image using light emitted from the light source.
  • an output unit that outputs a video signal and a control unit that detects a change in the image and adjusts the power that the light source driving unit supplies to the light source based on the detection result.
  • the display device control method includes a light source, a light source driving unit that supplies power to the light source and emits light from the light source, a display element that displays an image using light emitted from the light source, and
  • the display device control method includes: detecting a change in the image; and adjusting power supplied from the light source driving unit to the light source based on the detection result.
  • FIG. 1 is a block diagram showing a configuration of a projector according to a first embodiment of the present invention. It is a figure which shows an example of the correspondence of the no-change continuation time in this embodiment, and the electric power supplied to a light source.
  • 2 is a flowchart for explaining an operation example of the projector of FIG. 1. It is a figure for demonstrating an example of the power consumption reduction effect of the projector of FIG.
  • It is a block diagram which shows the structure of the projector concerning the 2nd Embodiment of this invention.
  • 6 is a flowchart for explaining an operation example of the projector of FIG. 5. It is a block diagram which shows the structure of the projector concerning the 3rd Embodiment of this invention.
  • FIG. 1 is a block diagram showing a configuration of a projector according to the first embodiment of the present invention.
  • a projector 100A shown in FIG. 1 is an example of a display device that displays an image using light emitted from a light source, and modulates light emitted from the light source based on a video signal input from a PC (Personal Computer) 200A.
  • the projection type image display device projects onto the screen 300.
  • the presenter displays a presentation material including a plurality of slides using the projector 100A and explains the presentation material.
  • the projector 100A includes a light source 11, a color wheel 12, an illumination optical system 13, a mirror 14, a DMD 15, a projection optical system 16, a video signal processing circuit 21, a DMD driving circuit 22, and a video comparison circuit 23. , A CPU (Central Processing Unit) circuit 24A, a light source driving circuit 25, and a color wheel driving circuit 26.
  • a CPU Central Processing Unit
  • the light source 11 emits light for displaying an image.
  • the light source 11 is a lamp that emits white light.
  • the color wheel 12 includes a disk including a plurality of transmission regions each having a different transmission wavelength range, and a motor for rotating the disk.
  • the illumination optical system 13 includes a light tunnel and a plurality of lenses that refract the light transmitted through the color wheel 12 to adjust the size of the light and make the adjusted light incident on the mirror 14. .
  • the mirror 14 reflects the light incident from the illumination optical system 13 and enters the DMD 15.
  • the DMD 15 is a reflective display element in which a plurality of minute mirrors are arranged in a matrix.
  • the DMD 15 outputs modulated light obtained by spatially modulating the light emitted from the light source 11.
  • each mirror included in the DMD 15 corresponds to a pixel of an image to be displayed and is driven by the DMD driving circuit 22 so that the angle of each mirror with respect to incident light is turned on or off.
  • the light reflected by the mirror in the ON state travels in the direction of the projection optical system 16.
  • the light reflected by the OFF mirror travels in a direction different from the direction of the projection optical system 16.
  • the ON state and the OFF state are switched at high speed, and by changing the temporal ratio between the ON state and the OFF state, the color gradation is expressed and an image is displayed.
  • the projection optical system 16 includes a plurality of lenses that enlarge and project the light reflected by the DMD 15 onto the screen 300.
  • the video signal processing circuit 21 performs video signal processing on the video signal input from the PC 200A and generates an image to be displayed by the DMD 15.
  • the video signal processing circuit 21 outputs a video signal subjected to video signal processing.
  • the video signal processing includes, for example, ⁇ correction processing, resolution conversion processing, frame rate processing for converting the number of frames per unit time, OSD (On Screen Display) processing, distortion correction processing, and the like.
  • the video signal processing circuit 21 outputs a timing signal used in the DMD driving circuit 22 and the like. Note that the video signal subjected to the video signal processing output from the video signal processing circuit 21 and the timing signal corresponding to the video signal are output in synchronization with the synchronization signal of the video signal input from the PC 200A. In some cases, the video signal is output in synchronization with the clock signal generated by the video signal processing circuit 21 without being synchronized with the synchronization signal of the video signal input from the PC 200A. Further, the video signal processing circuit 21 outputs the video signal to the video comparison circuit 23.
  • the DMD drive circuit 22 is a circuit that drives the DMD 15. Specifically, the DMD driving circuit 22 determines the angle with respect to the incident light of each mirror of the DMD 15 based on the video signal processed by the video signal processing circuit 21 and the timing signal corresponding to the video signal. Set to either ON state or OFF state. As a result, the DMD 15 outputs the modulated light obtained by modulating the incident light according to the video signal.
  • the video comparison circuit 23 is an example of an image comparison unit that compares the image of the current frame of the video signal output from the video signal processing circuit 21 with the image of the previous frame and outputs a comparison result signal indicating the comparison result. It is. Note that image comparison can be performed using a frame memory or the like that stores image data corresponding to the video signal of the previous frame. In this embodiment, the comparison result signal has a value of “0” when there is a change in the image and “1” when there is no change in the image.
  • the video signal output from the video signal processing circuit 21 to the video comparison circuit 23 is preferably a video signal before video signal processing, but may be a video signal after partial video signal processing.
  • the video signal output from the video signal processing circuit 21 to the video comparison circuit 23 is a video signal before performing the video signal processing. That is, the image indicated by the video signal input to the video signal processing circuit 21 is compared by the video comparison circuit 23.
  • the CPU circuit 24A is an example of a control unit that detects a change in the image output from the video signal processing circuit 21 and adjusts the power supplied from the light source driving circuit 25 to the light source 11 based on the detection result.
  • the CPU circuit 24A detects a change in the image output from the video signal processing circuit 21 according to the video signal based on the comparison result signal output from the video comparison circuit 23, and based on the detection result, The power supplied to the light source 11 is determined.
  • the CPU circuit 24A outputs a command indicating the determined power to the light source driving circuit 25.
  • the CPU circuit 24A determines that the image output from the video signal processing circuit 21 has changed.
  • the CPU circuit 24A determines that the image output from the video signal processing circuit 21 has not changed.
  • the CPU circuit 24A adjusts the power (PLamp) supplied to the light source 11 according to the non-change duration (tNC) that is the length of the period in which the image is not changed.
  • the CPU circuit 24A reduces the power supplied to the light source 11 as the non-change duration time is longer.
  • the CPU circuit 24A reduces the power supplied to the light source 11 in a stepwise manner.
  • the no-change duration corresponds to the duration in which a comparison result signal having a value of “1” is continuously input.
  • FIG. 2 is a diagram illustrating an example of a correspondence relationship between the unchanged duration and the power supplied to the light source in the present embodiment.
  • the maximum value of the power supplied to the light source 11 is 100%.
  • the maximum value of the power supplied to the light source 11 is not limited to 100%.
  • the lighting mode to be set is set when the lighting mode is set according to the maximum power consumption set in the light source 11, for example.
  • the maximum power value at 100% may be set to 100%, and other power ratios may be set as appropriate.
  • the lighting mode emphasizes, for example, the brightness of the screen, the rated power mode in which the power supplied to the light source 11 is the rated power, the life of the light source 11, and the like, and is lower than the rated power.
  • An eco mode that is supplied with electric power.
  • the CPU circuit 24A when a comparison result signal having a value of “0” is input, the CPU circuit 24A outputs a command a for setting the power to the maximum value of 100%. When the state where the value of the comparison result signal is “1” continues for one minute or longer, the CPU circuit 24A outputs a command b for setting the power to 90% of the maximum value. If the state where the value of the comparison result signal is “1” continues for a total of 3 minutes or more, the CPU circuit 24A outputs a command c for setting the power to 80% of the maximum value.
  • the CPU circuit 24A when the state where the value of the comparison result signal is “1” continues for a total of 5 minutes or more, the CPU circuit 24A outputs a command d for setting the power to 70% of the maximum value.
  • the CPU circuit 24A outputs a command a for setting the power to the maximum value of 100% when the comparison result signal having a value of “0” is input again when the power is set to the predetermined power. .
  • the power of the light source 11 when the non-change duration is 0 minute or more and less than 1 minute, the power of the light source 11 is set to 100%, and when the non-change duration is 1 minute or more and less than 3 minutes, the power of the light source 11 is set to 90%.
  • the power of the light source 11 is set to 80%, and when the non-change duration is 5 minutes or more, the power of the light source 11 is set to 70%.
  • a comparison result signal having a value of “0” is input regardless of the current power setting value of the light source 11, the power of the light source 11 is set to the initial value of 100%. However, depending on the current power setting value of the light source 11, it may be gradually returned to the initial value at a predetermined time.
  • the power of the current light source 11 when the power of the current light source 11 is set to 70%, when a comparison result signal having a value of “0” is input, the power is set to 80%, and after 5 seconds, the power is set to 90%. It may be set to 100% after 2 seconds.
  • the light source driving circuit 25 is an example of a light source driving unit that supplies power to the light source 11 to drive the light source 11. Specifically, the light source driving circuit 25 supplies power corresponding to the command output from the CPU circuit 24A to the light source 11 to emit light.
  • the color wheel drive circuit 26 is a circuit that drives the color wheel 12. Specifically, the color wheel drive circuit 26 rotates the color wheel 12 in accordance with the timing signal output from the video signal processing circuit 21 when the projector 100A is turned on. As a result, the color wheel 12 time-divides incident light into a plurality of color lights according to the video signal.
  • FIG. 3 is a flowchart for explaining an operation example of the projector 100A.
  • the CPU circuit 24A when the power of the projector 100A is turned on, the CPU circuit 24A operates a timer to count the elapsed time. Further, the CPU circuit 24A sets the power supplied to the light source 11 to a maximum value of 100%.
  • the video comparison circuit 23 compares images corresponding to the video signal for each frame, and generates and outputs a comparison result signal indicating the comparison result (step S100). Based on the comparison result signal output from the video comparison circuit 23, the CPU circuit 24A determines whether there is a change in the image. Specifically, the CPU circuit 24A determines that there has been a change in the image when the value of the comparison result signal is “0”, and there has been no change in the image when the value of the comparison result signal is “1”. Judgment is made (step S105).
  • the CPU circuit 24A When there is a change in the image, the CPU circuit 24A resets the timer and outputs the command a to the light source driving circuit 25 so that the power supplied to the light source 11 is set to a maximum value of 100% (step S110).
  • step S105 When there is no image change in step S105 and when the process of step S110 ends, the CPU circuit 24A determines that the image output from the video signal processing circuit 21 does not change based on the timer value. Is determined to be 1 minute or longer (step S115).
  • the CPU circuit 24A determines whether or not the unchanged time duration is 3 minutes or longer (step S120).
  • the CPU circuit 24A determines the power supplied to the light source 11 to a value of 90% of the maximum value (step S125).
  • the CPU circuit 24A determines whether or not the unchanged time duration is 5 minutes or longer (step S130).
  • the CPU circuit 24A determines the power supplied to the light source 11 to a value that is 80% of the maximum value (step S135).
  • the CPU circuit 24A determines the power supplied to the light source 11 to a value that is 70% of the maximum value (step S140).
  • the CPU circuit 24A adjusts the power supplied to the light source 11 by outputting a command corresponding to the determined power. Specifically, the CPU circuit 24A outputs a command b when the power is determined to be 90% of the maximum value, outputs a command c when the power is determined to be 80% of the maximum value, and the power is set to 70% of the maximum value. If it is determined to be%, the command d is output (step S145).
  • step S150 the CPU circuit 24A determines whether or not the power of the projector 100A is turned off. If the power is not turned off, the video comparison circuit 23 executes the process of step S100 again.
  • the projector 100A reduces the power supplied to the light source 11 in accordance with the non-change duration time during which the image output from the video signal processing circuit 21 does not change. Thereby, the power consumption of projector 100A can be reduced.
  • FIG. 4 is a diagram for explaining an example of the power consumption reduction effect of the projector 100A.
  • the comparative example is an example in which 100% of the power is always supplied to the light source from the time the power is turned on to the time the power is turned off without reducing the power.
  • the time when the presentation is started is time “0”.
  • the projector 100A is turned on.
  • the period from when the power is turned on to the start of the presentation is the preparation period, and the period from the start of the presentation to the end of the presentation after all slides are displayed is the presentation period.
  • the period from when the projector 100A is turned off to the power off period is referred to as a chat period.
  • the chatting period the last displayed slide 6 is displayed as it is.
  • the CPU circuit 24A When the slide is not displayed after 1 minute has elapsed since the power was turned on (for example, when a video signal is not input or a predetermined still image is continuously input), the CPU circuit 24A The power supplied to the light source 11 is changed to 90% of the maximum value. If no slide is displayed until 3 minutes have passed, the CPU circuit 24A changes the power supplied to the light source 11 to 80% of the maximum value. Further, when no slide is displayed until 5 minutes have passed, the CPU circuit 24A changes the power supplied to the light source 11 to 70% of the maximum value.
  • the CPU circuit 24A repeatedly determines whether or not there is a change in the video signal, and when there is a change in the video signal, changes the power to the maximum value of 100%.
  • the CPU circuit 24A determines whether or not the video signal has changed, and changes the power supplied to the light source 11 in accordance with the unchanged time duration.
  • the power supplied to the light source 11 has a maximum value of 100% during the period in which the no-change duration is less than 1 minute from the time when the slide is switched, and no change occurs if the no-change duration exceeds 1 minute. It is gradually reduced according to the length of change duration.
  • the unchanged duration is 5 minutes or more
  • the unchanged duration is 1 minute or more and less than 3 minutes
  • the non-change duration is 3 minutes or more and less than 5 minutes.
  • the area of the region (shaded area) sandwiched between the line indicating the power of the comparative example and the line indicating the power of the projector 100A is the magnitude of the power consumption that the projector 100A has reduced compared to the comparative example. Indicates.
  • the light source driving circuit 25 supplies the light source 11 based on the detection result of the change in the image output from the video signal processing circuit 21 (whether the image has changed). The power is adjusted. This makes it possible to reduce power consumption even when the luminance of the video signal continues to be high.
  • the power is adjusted according to the non-change duration time during which the image output from the video signal processing circuit 21 has not changed. Therefore, as the time during which the same image is displayed becomes longer, the attention level of the viewer with respect to the image often decreases. Therefore, the power supplied to the light source 11 is reduced in accordance with the decrease in the attention level. Is possible. For this reason, as the power supplied to the light source 11 decreases, the display screen becomes darker. Therefore, it is possible to darken the image in accordance with a decrease in the degree of attention to the image, and viewing by changing the brightness of the image. It is possible to suppress the influence on the person.
  • the time during which the displayed slide is focused is limited, and during the period when the displayed image is not focused, the presentation can be viewed even if the brightness of the image decreases.
  • the impact on the person is small.
  • the possibility that the displayed slide is attracting attention decreases as the state in which the slide to be displayed remains unchanged.
  • the title image may be displayed during the preparation period before the presentation starts or during the chat after the presentation ends. There is no particular problem even if the title image is dark.
  • the power supplied to the light source 11 according to the non-change duration time during which the image has not changed as described above, the brightness of the displayed image changes, and the effect on the viewer of the presentation
  • the power consumption can be reduced while suppressing the above.
  • the power supplied to the light source 11 is reduced 1 minute after switching the slide to be displayed. This is because it is generally said that the time for explaining one slide is preferably within one minute. As described above, it is desirable that the timing for reducing the power supplied to the light source 11 is set based on predictions such as explanation of the slide, question and answer, and the length of time required for discussion.
  • the power supplied to the light source 11 is reduced as the non-change duration time is longer.
  • the brightness of the image changes for content where the possibility that the viewer is paying attention to the displayed image decreases as the state of the image to be displayed, such as presentation material, has not changed for a long time. This makes it possible to suppress the influence on the viewer.
  • the electric power supplied to the light source 11 is reduced in steps. This makes it more difficult for viewers to recognize changes in image brightness due to reduced power, compared to when the power is switched directly from the maximum value to the minimum value, and the brightness of the image changes. By doing so, it is possible to reduce the uncomfortable feeling given to the viewer. Further, the power supplied to the light source 11 is adjusted to a value (initial value) before the power is reduced according to the timing at which the image is switched. It is possible to reduce the uncomfortable feeling given.
  • the video signal is compared for each frame, a comparison result signal indicating whether or not the video signal has changed is generated, and a change in the image is detected based on the comparison result signal.
  • the pointer when the pointer is superimposed on the presentation material, it is determined that the image is changing while the pointer is moving, and the time elapsed since the pointer operation was stopped is determined. The power is adjusted.
  • the animation display When the animation display is set in the presentation material, it is determined that the image is changing while the animation is being executed.
  • the pointer is moved or while the animation is being executed, it is highly likely that the displayed slide is being explained, and there is a high possibility that the viewer is paying attention to the displayed image. In such a case, power supplied to the light source 11 is reduced, and it is possible to suppress a reduction in image brightness.
  • FIG. 5 is a block diagram showing a configuration of a projector according to the second embodiment of the present invention.
  • the projector 100B shown in FIG. 5 does not have the video comparison circuit 23 as compared with the projector 100A according to the first embodiment of the present invention, and the PC 200B outputs as a control unit instead of the CPU circuit 24A.
  • the CPU circuit 24B adjusts the power supplied to the light source 11 based on the slide switching signal.
  • the CPU circuit 24B receives a slide switching signal output from the PC 200B to switch the image to be displayed to another image, and changes in the image output from the video signal processing circuit 21 based on the slide switching signal. , And a command indicating the power supplied to the light source 11 is output to the light source driving circuit 25 based on the detection result, thereby adjusting the power supplied to the light source 11.
  • the slide to be displayed is switched.
  • the slide switching signal indicates that the displayed slide is switched to another image.
  • the slide switching signal is a pulse signal corresponding to one of the two values, and usually takes the larger “Hi” value of the two values, and a predetermined period from the timing at which the slide is switched.
  • the value “Lo” is assumed.
  • the predetermined period in which the slide switching signal takes the value “Lo” is, for example, a period of one frame period or less of the video signal input to the video comparison circuit 23.
  • the slide switching signal may be a control signal including a predetermined command that is output at the timing of switching the slide, as long as the slide switching timing can be detected.
  • FIG. 6 is a flowchart for explaining an operation example of the projector 100B.
  • the CPU circuit 24B operates a timer to count the non-change duration time. At this time, the CPU circuit 24B outputs the command a to set the power supplied to the light source 11 to the maximum value of 100%.
  • the CPU circuit 24B determines whether or not a slide switching signal has been received (step S200). When the slide switching signal is received, the CPU circuit 24B resets the timer and outputs the command a to set the power of the light source 11 to the maximum value 100% (step S205).
  • step S210 When the slide switching signal is not received in step S200 and when the process of step S205 is completed, the CPU circuit 24B executes a power adjustment process for adjusting the power supplied to the light source 11 (step S210). Note that the power adjustment processing in step S210 corresponds to the processing from step S115 to step S145 in FIG. When the power adjustment process is executed, the power supplied to the light source 11 is adjusted according to the non-change duration time during which the image output from the video signal processing circuit 21 does not change.
  • the CPU circuit 24B determines whether or not the power source of the projector 100B is turned off (step S215). If the power is not turned off, the CPU circuit 24B executes the process of step S200.
  • a change in the image output from the video signal processing circuit 21 is detected based on the slide switching signal input from the PC 200B, and supplied to the light source 11 based on the detection result. Power to be adjusted.
  • the slide switching signal indicates a point in time when a switching operation for switching the image to be displayed is performed on the PC 200B. For this reason, it is possible to specify the time point when the image output from the video signal processing circuit 21 changes from the time point when the switching operation is performed. Therefore, the power to be supplied to the light source 11 is determined according to the elapsed time from when the switching operation is clearly performed, and the power can be determined according to the elapsed time from the time when the slide to be displayed is switched reliably. It becomes possible.
  • FIG. 7 is a block diagram showing a configuration of a projector according to the third embodiment of the present invention.
  • the projector 100C shown in FIG. 7 is different from the projector 100B according to the second embodiment of the present invention in that the power value determined by the PC 200C is used instead of the CPU circuit 24B that detects the image change based on the slide switching signal. And a CPU circuit 24C that adjusts the power supplied to the light source 11 based on the received power value.
  • the CPU circuit 24C receives the power value output from the PC 200C and adjusts the power supplied to the light source 11 based on the received power value. Specifically, the CPU circuit 24 ⁇ / b> C inputs a command indicating the power value received from the PC 200 ⁇ / b> C to the light source driving circuit 25.
  • the projector 100C adjusts the power supplied to the light source 11 according to the power value input from the outside of the projector 100C. Unlike the projectors 100A and 100B, the projector 100C determines the power supplied to the light source 11. Does not have.
  • FIG. 8 is a block diagram showing a configuration of the PC 200C connected to the projector 100C.
  • the PC 200C shown in FIG. 8 has a function of determining a power value supplied to the light source 11 of the projector 100C.
  • the PC 200C includes an output unit 201, an operation unit 202, and an application control unit 203.
  • the output unit 201 is an interface that outputs a video signal and a power value to the projector 100C.
  • the output unit 201 is connected to the projector 100C by wire or wireless.
  • the operation unit 202 inputs information to the PC 200C according to an operation from the user.
  • the operation unit 202 is, for example, a mouse, a touch panel, a keyboard, a button, a microphone, a switch, and a lever.
  • the operation unit 202 receives a switching operation for switching the slide to be displayed among the slides included in the presentation material.
  • the operation unit 202 generates an operation signal corresponding to a user operation and inputs the operation signal to the application control unit 203.
  • the application control unit 203 creates and displays presentation materials including a plurality of slides.
  • the application control unit 203 is a control device such as a CPU circuit, for example, and reads a program stored in a memory (not shown) and executes the program to generate a video signal generation unit 204 having the following functions.
  • a slide switching signal generation unit 205 and a light source power control unit 206 are realized.
  • the video signal generation unit 204 generates a video signal indicating the contents of the presentation material.
  • the slide switching signal generation unit 205 generates and outputs a slide switching signal indicating that an operation for changing an image to be displayed is performed based on the operation signal input from the operation unit 202.
  • the light source power control unit 206 determines the power to be supplied to the light source 11 of the projector 100C connected to the PC 200C, and supplies a display instruction for supplying the determined power to the light source 11 via the output unit 201. To enter. Specifically, the light source power control unit 206 receives the slide switching signal output from the slide switching signal generation unit 205, detects a change in the image output from the video signal processing circuit 21 based on the slide switching signal, and 11 determines the power value to be supplied to 11. More specifically, the light source power control unit 206 reduces the power supplied to the light source 11 according to the non-change duration time during which the image does not change.
  • FIG. 9 is a flowchart for explaining an operation example of the PC 200C.
  • the light source power control unit 206 determines whether or not a slide switching signal has been received from the slide switching signal generation unit 205 (step S300). When the slide switching signal is received, the light source power control unit 206 resets the timer (step S305).
  • step S310 the light source power control unit 206 executes a power determination process for determining a power value to be supplied to the light source 11 (step S310).
  • the power determination process in step S310 corresponds to the process from step S115 to step S140 in FIG.
  • the power to be supplied to the light source 11 is determined according to the non-change duration time.
  • the light source power control unit 206 outputs the determined power value to the projector 100C (step S315). Then, the light source power control unit 206 determines whether or not the power source of the projector 100C has been turned off (step S320). If the power is not turned off, the light source power control unit 206 executes the process of step S300 again.
  • the power to be supplied to the light source 11 of the projector 100C is determined in the PC 200C that is an information processing apparatus different from the projector 100C. As a result, it is possible to reduce the power consumption of the projector 100C without greatly changing the configuration of the projector 100C.
  • FIG. 10 is a block diagram showing a configuration of a projector according to the fourth embodiment of the present invention.
  • projectors 100A, 100B, and 100C display images corresponding to video signals input from PCs 200A, 200B, and 200C, respectively.
  • the projector 100D displays an image corresponding to the image data stored in the built-in storage circuit.
  • the projector 100D further includes an operation detection unit 27 and a storage circuit 28 as compared with the projector 100A according to the first embodiment of the present invention.
  • the operation detection unit 27 is a reception unit that receives a control signal generated according to an operation when a predetermined operation is performed on an input unit such as a remote controller, and the received control signal is transmitted to the CPU circuit 24D. Output to. For example, the operation detection unit 27 outputs, as a control signal, a slide switching instruction signal that instructs to switch an image to be displayed to another image to the CPU circuit 24D. The operation detection unit 27 detects the pointer position on the display image designated by operating the input unit, and outputs the detected pointer position to the CPU circuit 24D.
  • the storage circuit 28 is a storage unit that stores image data corresponding to each slide of the presentation material, for example.
  • the CPU circuit 24D reads the image from the storage circuit 28 and inputs it to the video signal processing circuit 21 in accordance with the slide switching instruction signal input from the operation detection unit 27. In accordance with the pointer position input from the operation detection unit 27, the video signal processing circuit 21 performs processing for superimposing and displaying the pointer.
  • the CPU circuit 24D reads the video signal of the image corresponding to the slide designated by the slide switching instruction signal from the storage circuit 28, and the video signal processing circuit To 21. Further, when the pointer position is input from the operation detection unit 27, the CPU 24 ⁇ / b> D outputs the pointer position to the video signal processing circuit 21.
  • the video signal processing circuit 21 performs various processes on the video signal output from the CPU 24D. At this time, the video signal processing circuit 21 superimposes a pointer on the slide using OSD processing. When performing the OSD process for superimposing the pointer, the video signal processing circuit 21 preferably outputs the image after the OSD process to the video comparison circuit 23.
  • the projector 100D having the video comparison circuit 23 is shown as an example of the projector having the storage circuit that stores the image data corresponding to the slide. You may detect based on a slide switching instruction
  • the projector 100D having a built-in storage circuit has been described, but the present invention is not limited to such an example.
  • the storage circuit may be an external device such as a USB (Universal Serial Bus) memory.
  • the projector has an external connection terminal such as a USB connector, and reads and displays the image data stored in the storage circuit of the external device connected via the external connection terminal.
  • the power is reduced stepwise according to the non-change duration, but the present invention is not limited to such an example.
  • the power may be continuously reduced.
  • the electric power is changed in the range of 70% to 100% of the maximum value, but the present invention is not limited to such an example. Depending on the type of light source and the like, it is possible to appropriately change the correspondence between the non-change duration and the power.
  • the projector using the DMD 15 which is an example of the display element is illustrated, but the present invention is not limited to such an example.
  • the display element is not limited to the DMD 15 and other display elements such as a liquid crystal panel may be used.
  • other display elements such as a liquid crystal panel may be used.
  • a drive circuit corresponding to the display element is used.
  • the display element is a liquid crystal display element, an LCD (Liquid Crystal Display) drive circuit is used as the drive circuit.
  • the front projector is shown as an example of the display device, but the present invention is not limited to such an example.
  • the display device may be any device that displays an image using light emitted from a light source.
  • a device that displays an image using light emitted from a light source include a rear projector, a transmissive liquid crystal display device, and a reflective liquid crystal display device.
  • the PC is illustrated as an example of the information processing apparatus that determines the power supplied to the light source of the display device, but the present invention is not limited to such an example.
  • the information processing device may be any device that can be connected to the display device in a wired or wireless manner and can input a video signal to the display device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

Provided is a display device in which power consumption can be reduced even when a state in which a video signal corresponding to a high brightness is maintained. A light source (11) emits light. A light source driving unit (25) supplies electrical power to the light source to cause the light source to emit light. A display element (15) displays an image using the light emitted by the light source. A video signal processor (21) generates an image displayed by the display element in accordance with the inputted video signal. A controller (24) detects a change in the image outputted by the video signal processor and adjusts the power supplied to the light source on the basis of the detection result.

Description

表示装置、情報処理装置、および表示装置の制御方法Display device, information processing device, and display device control method
　本発明は、表示装置、情報処理装置、および表示装置の制御方法。 The present invention relates to a display device, an information processing device, and a display device control method.
　プロジェクタや液晶表示装置などのような光源が出射する光を用いて画像を表示する表示装置では、消費電力の大部分は、光源の電力である。このため、このような表示装置の消費電力を低減しようとする場合には、光源に供給する電力を低減することが効果的である。しかしながら、光源に供給する電力を一律に下げると、表示される画像が暗くなってしまい、ユーザが画像を視認しづらくなってしまう。 In a display device that displays an image using light emitted from a light source such as a projector or a liquid crystal display device, most of the power consumption is the power of the light source. For this reason, in order to reduce the power consumption of such a display device, it is effective to reduce the power supplied to the light source. However, when the power supplied to the light source is uniformly reduced, the displayed image becomes dark, and it becomes difficult for the user to visually recognize the image.
　これに対して、特許文献１には、映像信号の輝度に応じて光源に供給する電力を変化させるプロジェクタ装置が開示されている。このプロジェクタ装置は、映像信号の輝度が低い場合、光源に供給する電力を低減し、その低減率に合わせて映像信号の輝度を増加させることで、表示する画像の明るさを変化させることなく、消費電力を低減している。 On the other hand, Patent Document 1 discloses a projector device that changes the power supplied to the light source in accordance with the luminance of the video signal. This projector device reduces the power supplied to the light source when the luminance of the video signal is low, and increases the luminance of the video signal in accordance with the reduction rate without changing the brightness of the displayed image. Power consumption is reduced.
特開２０１０－１３９５１７号公報JP 2010-139517 A
　しかしながら、特許文献１に記載のプロジェクタ装置では、映像信号の輝度が高い状態が続く場合には光源に供給する電力が低減されないため、消費電力を低減することができないという問題があった。 However, the projector device described in Patent Document 1 has a problem that power consumption cannot be reduced because power supplied to the light source is not reduced when the luminance of the video signal continues to be high.
　例えば、プロジェクタ装置がプレゼンテーションに使用される場合、白い背景に明るい絵柄を重畳したスライドが表示されることが多い。この場合、映像信号の輝度が高い状態が続くこととなり、光源に供給する電力が低減されない。 For example, when a projector device is used for a presentation, a slide with a bright pattern superimposed on a white background is often displayed. In this case, the state in which the luminance of the video signal is high continues, and the power supplied to the light source is not reduced.
　本発明の目的は、映像信号の輝度が高い状態が続く場合でも、消費電力を低減することが可能な表示装置、情報処理装置、および表示装置の制御方法を提供することである。 An object of the present invention is to provide a display device, an information processing device, and a display device control method capable of reducing power consumption even when the luminance of a video signal continues to be high.
　本発明による表示装置は、光源と、前記光源に電力を供給して、前記光源から光を出射させる光源駆動部と、前記光源が出射した光を用いて画像を表示する表示素子と、入力された映像信号に応じて前記表示素子が表示する画像を生成する映像信号処理部と、前記映像信号処理部が出力する画像の変化を検出し、当該検出結果に基づいて、前記光源駆動部が前記光源に供給する電力を調整する制御部と、を有する。 A display device according to the present invention receives a light source, a light source driving unit that supplies power to the light source and emits light from the light source, and a display element that displays an image using light emitted from the light source. A video signal processing unit that generates an image to be displayed by the display element in response to the received video signal, and a change in the image output by the video signal processing unit. Based on the detection result, the light source driving unit And a controller that adjusts the power supplied to the light source.
　本発明による情報処理装置は、光源、前記光源に電力を供給して前記光源から光を出射させる光源駆動部、および前記光源が出射する光を用いて画像を表示する表示素子を有する表示装置に対して、映像信号を出力する出力部と、前記画像の変化を検出し、当該検出結果に基づいて、前記光源駆動部が前記光源に供給する電力を調整する制御部と、を有する。 An information processing apparatus according to the present invention is a display device having a light source, a light source driving unit that supplies power to the light source to emit light from the light source, and a display element that displays an image using light emitted from the light source. On the other hand, an output unit that outputs a video signal and a control unit that detects a change in the image and adjusts the power that the light source driving unit supplies to the light source based on the detection result.
　本発明による表示装置の制御方法は、光源、および前記光源に電力を供給して前記光源から光を出射させる光源駆動部と、前記光源が出射する光を用いて画像を表示する表示素子と、を有する表示装置の制御方法であって、前記画像の変化を検出し、前記検出結果に基づいて、前記光源駆動部が前記光源に供給する電力を調整する。 The display device control method according to the present invention includes a light source, a light source driving unit that supplies power to the light source and emits light from the light source, a display element that displays an image using light emitted from the light source, and The display device control method includes: detecting a change in the image; and adjusting power supplied from the light source driving unit to the light source based on the detection result.
　本発明によれば、映像信号の輝度が高い状態が続く場合でも、消費電力を低減することが可能である。 According to the present invention, power consumption can be reduced even when the luminance of the video signal continues to be high.
本発明の第１の実施形態にかかるプロジェクタの構成を示すブロック図である。1 is a block diagram showing a configuration of a projector according to a first embodiment of the present invention. 本実施形態における無変化継続時間と光源に供給する電力との対応関係の一例を示す図である。It is a figure which shows an example of the correspondence of the no-change continuation time in this embodiment, and the electric power supplied to a light source. 図１のプロジェクタの動作例を説明するためのフローチャートである。2 is a flowchart for explaining an operation example of the projector of FIG. 1. 図１のプロジェクタの消費電力低減効果の一例について説明するための図である。It is a figure for demonstrating an example of the power consumption reduction effect of the projector of FIG. 本発明の第２の実施形態にかかるプロジェクタの構成を示すブロック図である。It is a block diagram which shows the structure of the projector concerning the 2nd Embodiment of this invention. 図５のプロジェクタの動作例を説明するためのフローチャートである。6 is a flowchart for explaining an operation example of the projector of FIG. 5. 本発明の第３の実施形態にかかるプロジェクタの構成を示すブロック図である。It is a block diagram which shows the structure of the projector concerning the 3rd Embodiment of this invention. 図７のプロジェクタと接続されたＰＣの構成を示すブロック図である。It is a block diagram which shows the structure of PC connected with the projector of FIG. 図８のＰＣの動作例を説明するためのフローチャートである。It is a flowchart for demonstrating the operation example of PC of FIG. 本発明の第４の実施形態にかかるプロジェクタの構成を示すブロック図である。It is a block diagram which shows the structure of the projector concerning the 4th Embodiment of this invention.
　以下、本発明の実施形態について添付の図面を参照して説明する。なお、本明細書および図面において、同一の機能を有する構成要素については同じ符号を付することにより重複説明を省略する場合がある。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, in this specification and drawing, the description which overlaps may be abbreviate | omitted by attaching | subjecting the same code | symbol about the component which has the same function.
　（第１の実施形態）
　図１は、本発明の第１の実施形態にかかるプロジェクタの構成を示すブロック図である。図１に示すプロジェクタ１００Ａは、光源が出射する光を用いて画像を表示する表示装置の一例であり、ＰＣ（Ｐｅｒｓｏｎａｌ　Ｃｏｍｐｕｔｅｒ）２００Ａから入力される映像信号に基づいて光源から出射された光を変調してスクリーン３００に投写する投写型画像表示装置である。なお、以下の説明では、発表者が複数枚のスライドを含むプレゼンテーション資料をプロジェクタ１００Ａを用いて表示し、このプレゼンテーション資料について説明する場面を想定する。 (First embodiment)
FIG. 1 is a block diagram showing a configuration of a projector according to the first embodiment of the present invention. A projector 100A shown in FIG. 1 is an example of a display device that displays an image using light emitted from a light source, and modulates light emitted from the light source based on a video signal input from a PC (Personal Computer) 200A. Thus, the projection type image display device projects onto the screen 300. In the following description, it is assumed that the presenter displays a presentation material including a plurality of slides using the projector 100A and explains the presentation material.
　プロジェクタ１００Ａは、光源１１と、カラーホイール１２と、照明光学系１３と、ミラー１４と、ＤＭＤ１５と、投写光学系１６と、映像信号処理回路２１と、ＤＭＤ駆動回路２２と、映像比較回路２３と、ＣＰＵ（Ｃｅｎｔｒａｌ　Ｐｒｏｃｅｓｓｉｎｇ　Ｕｎｉｔ）回路２４Ａと、光源駆動回路２５と、カラーホイール駆動回路２６と、を有する。 The projector 100A includes a light source 11, a color wheel 12, an illumination optical system 13, a mirror 14, a DMD 15, a projection optical system 16, a video signal processing circuit 21, a DMD driving circuit 22, and a video comparison circuit 23. , A CPU (Central Processing Unit) circuit 24A, a light source driving circuit 25, and a color wheel driving circuit 26.
　光源１１は、画像を表示するための光を出射する。本実施形態では、光源１１は、白色光を出射するランプであるとする。 The light source 11 emits light for displaying an image. In the present embodiment, it is assumed that the light source 11 is a lamp that emits white light.
　カラーホイール１２は、透過波長域がそれぞれ異なる複数の透過領域を含む円盤と円盤を回転させるモータとを含む。 The color wheel 12 includes a disk including a plurality of transmission regions each having a different transmission wavelength range, and a motor for rotating the disk.
　照明光学系１３は、カラーホイール１２を透過した光を屈折させることで、光の大きさを調整し、その大きさを調整した光をミラー１４に入射させる、ライトトンネルと複数のレンズとを含む。 The illumination optical system 13 includes a light tunnel and a plurality of lenses that refract the light transmitted through the color wheel 12 to adjust the size of the light and make the adjusted light incident on the mirror 14. .
　ミラー１４は、照明光学系１３から入射された光を反射してＤＭＤ１５に入射する。 The mirror 14 reflects the light incident from the illumination optical system 13 and enters the DMD 15.
　ＤＭＤ１５は、複数の微小なミラーをマトリックス状に並べた反射型の表示素子である。ＤＭＤ１５は、光源１１が出射した光を空間変調した変調光を出力する。具体的には、ＤＭＤ１５に含まれる各ミラーは、表示される画像の画素に対応しており、ＤＭＤ駆動回路２２によって駆動され、入射光に対する各ミラーの角度はＯＮ状態またはＯＦＦ状態になる。ＯＮ状態のミラーが反射した光は、投写光学系１６方向に進行する。一方ＯＦＦ状態のミラーが反射した光は投写光学系１６方向とは異なる方向に進行する。このＯＮ状態とＯＦＦ状態とが高速で切り替えられ、ＯＮ状態とＯＦＦ状態との時間的な比率を変化させることで、色の階調が表現され、画像が表示される。 The DMD 15 is a reflective display element in which a plurality of minute mirrors are arranged in a matrix. The DMD 15 outputs modulated light obtained by spatially modulating the light emitted from the light source 11. Specifically, each mirror included in the DMD 15 corresponds to a pixel of an image to be displayed and is driven by the DMD driving circuit 22 so that the angle of each mirror with respect to incident light is turned on or off. The light reflected by the mirror in the ON state travels in the direction of the projection optical system 16. On the other hand, the light reflected by the OFF mirror travels in a direction different from the direction of the projection optical system 16. The ON state and the OFF state are switched at high speed, and by changing the temporal ratio between the ON state and the OFF state, the color gradation is expressed and an image is displayed.
　投写光学系１６は、ＤＭＤ１５が反射した光を拡大してスクリーン３００に投写する複数のレンズを含む。 The projection optical system 16 includes a plurality of lenses that enlarge and project the light reflected by the DMD 15 onto the screen 300.
　映像信号処理回路２１は、ＰＣ２００Ａから入力された映像信号に対する映像信号処理を行い、ＤＭＤ１５が表示する画像を生成する。映像信号処理回路２１は、映像信号処理を行った映像信号を出力する。映像信号処理は、例えばγ補正処理、解像度変換処理、単位時間当たりのフレーム数を変換するフレームレート処理、ＯＳＤ（Ｏｎ　Ｓｃｒｅｅｎ　Ｄｉｓｐｌａｙ）処理および歪み補正処理などである。 The video signal processing circuit 21 performs video signal processing on the video signal input from the PC 200A and generates an image to be displayed by the DMD 15. The video signal processing circuit 21 outputs a video signal subjected to video signal processing. The video signal processing includes, for example, γ correction processing, resolution conversion processing, frame rate processing for converting the number of frames per unit time, OSD (On Screen Display) processing, distortion correction processing, and the like.
　また、映像信号処理回路２１は、ＤＭＤ駆動回路２２等で用いられるタイミング信号を出力する。なお、映像信号処理回路２１から出力される映像信号処理が行われた映像信号および該映像信号に対応するタイミング信号は、ＰＣ２００Ａから入力された映像信号の同期信号に同期して出力される場合と、ＰＣ２００Ａから入力された映像信号の同期信号に同期せずに、映像信号処理回路２１が生成するクロック信号に同期して出力される場合などがある。また、映像信号処理回路２１は、映像信号を映像比較回路２３に出力する。 The video signal processing circuit 21 outputs a timing signal used in the DMD driving circuit 22 and the like. Note that the video signal subjected to the video signal processing output from the video signal processing circuit 21 and the timing signal corresponding to the video signal are output in synchronization with the synchronization signal of the video signal input from the PC 200A. In some cases, the video signal is output in synchronization with the clock signal generated by the video signal processing circuit 21 without being synchronized with the synchronization signal of the video signal input from the PC 200A. Further, the video signal processing circuit 21 outputs the video signal to the video comparison circuit 23.
　ＤＭＤ駆動回路２２は、ＤＭＤ１５を駆動する回路である。具体的には、ＤＭＤ駆動回路２２は、映像信号処理回路２１が出力した映像信号処理が行われた映像信号および映像信号に対応するタイミング信号に基づいて、ＤＭＤ１５の各ミラーの入射光に対する角度をＯＮ状態またはＯＦＦ状態のいずれかにする。これにより、ＤＭＤ１５は、入射光が映像信号に応じて変調された変調光を出力することになる。 The DMD drive circuit 22 is a circuit that drives the DMD 15. Specifically, the DMD driving circuit 22 determines the angle with respect to the incident light of each mirror of the DMD 15 based on the video signal processed by the video signal processing circuit 21 and the timing signal corresponding to the video signal. Set to either ON state or OFF state. As a result, the DMD 15 outputs the modulated light obtained by modulating the incident light according to the video signal.
　映像比較回路２３は、映像信号処理回路２１が出力した映像信号の現在のフレームの画像と１つ前のフレームの画像とを比較し、比較結果を示す比較結果信号を出力する画像比較部の一例である。なお、画像の比較は、１つ前のフレームの映像信号に対応する画像データを格納するフレームメモリ等を用いて行うことができる。本実施形態において比較結果信号は、画像に変化がある場合「０」、画像に変化がない場合「１」の値をとるものとする。 The video comparison circuit 23 is an example of an image comparison unit that compares the image of the current frame of the video signal output from the video signal processing circuit 21 with the image of the previous frame and outputs a comparison result signal indicating the comparison result. It is. Note that image comparison can be performed using a frame memory or the like that stores image data corresponding to the video signal of the previous frame. In this embodiment, the comparison result signal has a value of “0” when there is a change in the image and “1” when there is no change in the image.
　映像信号処理回路２１が映像比較回路２３に出力する映像信号は、映像信号処理を行う前の映像信号が望ましいが、一部の映像信号処理を行った後の映像信号でも良い。映像信号処理を行う前の映像信号を用いて画像を比較する場合、例えば、映像信号処理に伴う誤差等による誤判定を防止することができる。ここでは、映像信号処理回路２１が映像比較回路２３に出力する映像信号は、映像信号処理を行う前の映像信号とする。つまり、映像信号処理回路２１に入力された映像信号が示す画像が、映像比較回路２３で比較される。 The video signal output from the video signal processing circuit 21 to the video comparison circuit 23 is preferably a video signal before video signal processing, but may be a video signal after partial video signal processing. When images are compared using video signals before video signal processing, for example, erroneous determination due to errors associated with video signal processing can be prevented. Here, the video signal output from the video signal processing circuit 21 to the video comparison circuit 23 is a video signal before performing the video signal processing. That is, the image indicated by the video signal input to the video signal processing circuit 21 is compared by the video comparison circuit 23.
　ＣＰＵ回路２４Ａは、映像信号処理回路２１が出力する画像の変化を検出し、当該検出結果に基づいて、光源駆動回路２５が光源１１に供給する電力を調整する制御部の一例である。本実施形態では、ＣＰＵ回路２４Ａは、映像比較回路２３が出力した比較結果信号に基づいて映像信号に応じて映像信号処理回路２１が出力する画像の変化を検出し、当該検出結果に基づいて、光源１１に供給する電力を決定する。ＣＰＵ回路２４Ａは、決定した電力を示すコマンドを光源駆動回路２５に出力する。 The CPU circuit 24A is an example of a control unit that detects a change in the image output from the video signal processing circuit 21 and adjusts the power supplied from the light source driving circuit 25 to the light source 11 based on the detection result. In the present embodiment, the CPU circuit 24A detects a change in the image output from the video signal processing circuit 21 according to the video signal based on the comparison result signal output from the video comparison circuit 23, and based on the detection result, The power supplied to the light source 11 is determined. The CPU circuit 24A outputs a command indicating the determined power to the light source driving circuit 25.
　具体的には、ＣＰＵ回路２４Ａは、値が「０」である比較結果信号が入力されると、映像信号処理回路２１が出力する画像が変化したと判断する。一方ＣＰＵ回路２４Ａは、値が「１」である比較結果信号が入力されると、映像信号処理回路２１が出力する画像が変化していないと判断する。そしてＣＰＵ回路２４Ａは、この画像が変化していない期間の長さである無変化継続時間（ｔＮＣ）に応じて、光源１１に供給する電力（ＰＬａｍｐ）を調整する。このときＣＰＵ回路２４Ａは、無変化継続時間が長いほど、光源１１に供給する電力を低減する。またＣＰＵ回路２４Ａは、光源１１に供給する電力を段階的に低減する。なお無変化継続時間は、値が「１」である比較結果信号が連続して入力されている状態の継続時間に相当する。 Specifically, when a comparison result signal having a value of “0” is input, the CPU circuit 24A determines that the image output from the video signal processing circuit 21 has changed. On the other hand, when a comparison result signal having a value of “1” is input, the CPU circuit 24A determines that the image output from the video signal processing circuit 21 has not changed. Then, the CPU circuit 24A adjusts the power (PLamp) supplied to the light source 11 according to the non-change duration (tNC) that is the length of the period in which the image is not changed. At this time, the CPU circuit 24A reduces the power supplied to the light source 11 as the non-change duration time is longer. The CPU circuit 24A reduces the power supplied to the light source 11 in a stepwise manner. The no-change duration corresponds to the duration in which a comparison result signal having a value of “1” is continuously input.
　図２は、本実施形態における無変化継続時間と光源に供給する電力との対応関係の一例を示す図である。なお、図２では、光源１１に供給する電力の最大値を１００％としている。ただし、光源１１に供給する電力の最大値を１００％とすることに限定されず、例えば、光源１１に設定する最大消費電力に応じて点灯モードが設定されている場合など、設定される点灯モードにおける電力の最大値を１００％として、他の電力の割合を適宜設定してもよい。ここで、点灯モードとは、例えば、画面の明るさなどが重視され、光源１１に供給される電力が定格電力である定格電力モードや、光源１１の寿命などが重視され、定格電力よりも低い電力で供給されるエコモード等である。 FIG. 2 is a diagram illustrating an example of a correspondence relationship between the unchanged duration and the power supplied to the light source in the present embodiment. In FIG. 2, the maximum value of the power supplied to the light source 11 is 100%. However, the maximum value of the power supplied to the light source 11 is not limited to 100%. For example, the lighting mode to be set is set when the lighting mode is set according to the maximum power consumption set in the light source 11, for example. The maximum power value at 100% may be set to 100%, and other power ratios may be set as appropriate. Here, the lighting mode emphasizes, for example, the brightness of the screen, the rated power mode in which the power supplied to the light source 11 is the rated power, the life of the light source 11, and the like, and is lower than the rated power. An eco mode that is supplied with electric power.
　図２の例では、値が「０」である比較結果信号が入力された場合、ＣＰＵ回路２４Ａは、電力を最大値１００％に設定するためのコマンドａを出力する。そして比較結果信号の値が「１」である状態が１分以上続いた場合、ＣＰＵ回路２４Ａは、電力を最大値の９０％に設定するためのコマンドｂを出力する。また引き続き比較結果信号の値が「１」である状態が合計３分以上続いた場合、ＣＰＵ回路２４Ａは、電力を最大値の８０％に設定するためのコマンドｃを出力する。さらに引き続き比較結果信号の値が「１」である状態が合計５分以上続いた場合、ＣＰＵ回路２４Ａは、電力を最大値の７０％に設定するためのコマンドｄを出力する。なお、ＣＰＵ回路２４Ａは、所定の電力に設定されているときに、再び値が「０」の比較結果信号が入力されると、電力を最大値１００％に設定するためのコマンドａを出力する。 In the example of FIG. 2, when a comparison result signal having a value of “0” is input, the CPU circuit 24A outputs a command a for setting the power to the maximum value of 100%. When the state where the value of the comparison result signal is “1” continues for one minute or longer, the CPU circuit 24A outputs a command b for setting the power to 90% of the maximum value. If the state where the value of the comparison result signal is “1” continues for a total of 3 minutes or more, the CPU circuit 24A outputs a command c for setting the power to 80% of the maximum value. Further, when the state where the value of the comparison result signal is “1” continues for a total of 5 minutes or more, the CPU circuit 24A outputs a command d for setting the power to 70% of the maximum value. The CPU circuit 24A outputs a command a for setting the power to the maximum value of 100% when the comparison result signal having a value of “0” is input again when the power is set to the predetermined power. .
　つまり、無変化継続時間が０分以上１分未満の場合、光源１１の電力は１００％に設定され、無変化継続時間が１分以上３分未満の場合、光源１１の電力は９０％に設定され、無変化継続時間が３分以上５分未満の場合、光源１１の電力は８０％に設定され、無変化継続時間が５分以上の場合、光源１１の電力は７０％に設定される。また、現在の光源１１の電力の設定値にかかわらず、値が「０」の比較結果信号が入力されると、光源１１の電力は初期値である１００％に設定される。ただし、現在の光源１１の電力の設定値に応じて、所定の時間で徐々に、初期値まで戻るようにしてもよい。例えば、現在の光源１１の電力が７０％に設定されているとき、値が「０」の比較結果信号が入力されると８０％に設定され、その５秒後に９０％に設定され、さらに５秒後に１００％に設定されるようにしてもよい。 That is, when the non-change duration is 0 minute or more and less than 1 minute, the power of the light source 11 is set to 100%, and when the non-change duration is 1 minute or more and less than 3 minutes, the power of the light source 11 is set to 90%. When the non-change duration is 3 minutes or more and less than 5 minutes, the power of the light source 11 is set to 80%, and when the non-change duration is 5 minutes or more, the power of the light source 11 is set to 70%. When a comparison result signal having a value of “0” is input regardless of the current power setting value of the light source 11, the power of the light source 11 is set to the initial value of 100%. However, depending on the current power setting value of the light source 11, it may be gradually returned to the initial value at a predetermined time. For example, when the power of the current light source 11 is set to 70%, when a comparison result signal having a value of “0” is input, the power is set to 80%, and after 5 seconds, the power is set to 90%. It may be set to 100% after 2 seconds.
　光源駆動回路２５は、光源１１に電力を供給して、光源１１を駆動する光源駆動部の一例である。具体的には、光源駆動回路２５は、ＣＰＵ回路２４Ａが出力したコマンドに応じた電力を光源１１に供給し、光を出射させる。 The light source driving circuit 25 is an example of a light source driving unit that supplies power to the light source 11 to drive the light source 11. Specifically, the light source driving circuit 25 supplies power corresponding to the command output from the CPU circuit 24A to the light source 11 to emit light.
　カラーホイール駆動回路２６は、カラーホイール１２を駆動する回路である。具体的には、カラーホイール駆動回路２６は、プロジェクタ１００Ａの電源が入れられると、映像信号処理回路２１が出力したタイミング信号に合わせてカラーホイール１２を回転させる。これにより、カラーホイール１２は、入射光を映像信号に応じて複数の色光に時分割することになる。 The color wheel drive circuit 26 is a circuit that drives the color wheel 12. Specifically, the color wheel drive circuit 26 rotates the color wheel 12 in accordance with the timing signal output from the video signal processing circuit 21 when the projector 100A is turned on. As a result, the color wheel 12 time-divides incident light into a plurality of color lights according to the video signal.
　図３は、プロジェクタ１００Ａの動作例を説明するためのフローチャートである。 FIG. 3 is a flowchart for explaining an operation example of the projector 100A.
　なお図示していないが、ＣＰＵ回路２４Ａは、プロジェクタ１００Ａの電源が入れられると、タイマーを動作させて経過時間をカウントする。またＣＰＵ回路２４Ａは、光源１１に供給される電力を最大値１００％とする。 Although not shown, when the power of the projector 100A is turned on, the CPU circuit 24A operates a timer to count the elapsed time. Further, the CPU circuit 24A sets the power supplied to the light source 11 to a maximum value of 100%.
　まず映像比較回路２３は、映像信号に応じた画像をフレームごとに比較し、当該比較結果を示す比較結果信号を生成して出力する（ステップＳ１００）。映像比較回路２３が出力した比較結果信号に基づいて、ＣＰＵ回路２４Ａは、画像の変化の有無を判断する。具体的にはＣＰＵ回路２４Ａは、比較結果信号の値が「０」である場合、画像の変化があったと判断し、比較結果信号の値が「１」である場合、画像の変化がなかったものと判断する（ステップＳ１０５）。 First, the video comparison circuit 23 compares images corresponding to the video signal for each frame, and generates and outputs a comparison result signal indicating the comparison result (step S100). Based on the comparison result signal output from the video comparison circuit 23, the CPU circuit 24A determines whether there is a change in the image. Specifically, the CPU circuit 24A determines that there has been a change in the image when the value of the comparison result signal is “0”, and there has been no change in the image when the value of the comparison result signal is “1”. Judgment is made (step S105).
　画像の変化があった場合、ＣＰＵ回路２４Ａは、タイマーをリセットするとともに、コマンドａを光源駆動回路２５に出力して、光源１１に供給される電力を最大値１００％とする（ステップＳ１１０）。 When there is a change in the image, the CPU circuit 24A resets the timer and outputs the command a to the light source driving circuit 25 so that the power supplied to the light source 11 is set to a maximum value of 100% (step S110).
　ステップＳ１０５で画像の変化がなかった場合、および、ステップＳ１１０の処理が終了した場合、ＣＰＵ回路２４Ａは、タイマーの値に基づいて、映像信号処理回路２１が出力する画像が変化しない無変化継続時間が１分以上であるか否かを判断する（ステップＳ１１５）。 When there is no image change in step S105 and when the process of step S110 ends, the CPU circuit 24A determines that the image output from the video signal processing circuit 21 does not change based on the timer value. Is determined to be 1 minute or longer (step S115).
　無変化継続時間が１分以上である場合、ＣＰＵ回路２４Ａは、無変化継続時間が３分以上であるか否かを判断する（ステップＳ１２０）。 When the unchanged time duration is 1 minute or longer, the CPU circuit 24A determines whether or not the unchanged time duration is 3 minutes or longer (step S120).
　無変化継続時間が３分以上でない場合、ＣＰＵ回路２４Ａは、光源１１に供給する電力を最大値の９０％の値に決定する（ステップＳ１２５）。 If the non-change duration is not 3 minutes or more, the CPU circuit 24A determines the power supplied to the light source 11 to a value of 90% of the maximum value (step S125).
　一方、無変化継続時間が３分以上である場合、ＣＰＵ回路２４Ａは、無変化継続時間が５分以上であるか否かを判断する（ステップＳ１３０）。 On the other hand, when the unchanged time duration is 3 minutes or longer, the CPU circuit 24A determines whether or not the unchanged time duration is 5 minutes or longer (step S130).
　無変化継続時間が５分以上でない場合、ＣＰＵ回路２４Ａは、光源１１に供給する電力を最大値の８０％の値に決定する（ステップＳ１３５）。 If the no-change duration is not 5 minutes or more, the CPU circuit 24A determines the power supplied to the light source 11 to a value that is 80% of the maximum value (step S135).
　一方、無変化継続時間が５分以上である場合、ＣＰＵ回路２４Ａは、光源１１に供給する電力を最大値の７０％の値に決定する（ステップＳ１４０）。 On the other hand, when the non-change duration is 5 minutes or more, the CPU circuit 24A determines the power supplied to the light source 11 to a value that is 70% of the maximum value (step S140).
　次にＣＰＵ回路２４Ａは、決定した電力に応じたコマンドを出力することで光源１１に供給する電力を調整する。具体的には、ＣＰＵ回路２４Ａは、電力を最大値の９０％に決定した場合コマンドｂを出力し、電力を最大値の８０％に決定した場合コマンドｃを出力し、電力を最大値の７０％に決定した場合コマンドｄを出力する（ステップＳ１４５）。 Next, the CPU circuit 24A adjusts the power supplied to the light source 11 by outputting a command corresponding to the determined power. Specifically, the CPU circuit 24A outputs a command b when the power is determined to be 90% of the maximum value, outputs a command c when the power is determined to be 80% of the maximum value, and the power is set to 70% of the maximum value. If it is determined to be%, the command d is output (step S145).
　次にＣＰＵ回路２４Ａは、プロジェクタ１００Ａの電源がＯＦＦ状態とされたか否かを判断する（ステップＳ１５０）。そして電源がＯＦＦ状態とされていない場合、映像比較回路２３は、再びステップＳ１００の処理を実行する。 Next, the CPU circuit 24A determines whether or not the power of the projector 100A is turned off (step S150). If the power is not turned off, the video comparison circuit 23 executes the process of step S100 again.
　以上説明したように、プロジェクタ１００Ａは、映像信号処理回路２１が出力する画像が変化しない無変化継続時間に応じて、光源１１に供給する電力を低減する。これにより、プロジェクタ１００Ａの消費電力を低減することが可能になる。 As described above, the projector 100A reduces the power supplied to the light source 11 in accordance with the non-change duration time during which the image output from the video signal processing circuit 21 does not change. Thereby, the power consumption of projector 100A can be reduced.
　図４は、プロジェクタ１００Ａの消費電力低減効果の一例について説明するための図である。 FIG. 4 is a diagram for explaining an example of the power consumption reduction effect of the projector 100A.
　ここでは、ＰＣ２００Ａから６枚のスライドを含むプレゼンテーション資料をプロジェクタ１００Ａで表示する場合に、光源１１に供給する電力の最大値を１００％としたときの電力の推移を示している。なお比較例は、電力を低減せずに電源が投入されてから切断されるまでの間、常に１００％の電力が光源に供給される例である。 Here, when the presentation material including six slides from the PC 200A is displayed on the projector 100A, the transition of the power when the maximum value of the power supplied to the light source 11 is 100% is shown. The comparative example is an example in which 100% of the power is always supplied to the light source from the time the power is turned on to the time the power is turned off without reducing the power.
　図４において、プレゼンテーションをスタートした時点を時間「０」とする。－２０分時点付近において、プロジェクタ１００Ａの電源がＯＮ状態にされる。電源がＯＮ状態にされてからプレゼンテーションをスタートするまでの期間を準備期間とし、プレゼンテーションをスタートしてからすべてのスライドを表示した後プレゼンテーションを終了するまでの期間をプレゼンテーション期間とし、プレゼンテーションを終了してからプロジェクタ１００Ａの電源がＯＦＦ状態にされるまでの期間を歓談期間とする。なお、歓談期間において、最後に表示されたスライド６がそのまま表示された状態とする。 In FIG. 4, the time when the presentation is started is time “0”. Around -20 minutes, the projector 100A is turned on. The period from when the power is turned on to the start of the presentation is the preparation period, and the period from the start of the presentation to the end of the presentation after all slides are displayed is the presentation period. The period from when the projector 100A is turned off to the power off period is referred to as a chat period. In the chatting period, the last displayed slide 6 is displayed as it is.
　電源がＯＮ状態とされた後、１分経過した時点でスライドが表示されない場合（例えば、映像信号が入力されない場合や所定の静止画が継続して入力されている場合）、ＣＰＵ回路２４Ａは、光源１１に供給する電力を最大値の９０％に変更する。またそのまま３分経過した時点までスライドが表示されない場合、ＣＰＵ回路２４Ａは、光源１１に供給する電力を最大値の８０％に変更する。さらにそのまま５分経過した時点までスライドが表示されない場合、ＣＰＵ回路２４Ａは、光源１１に供給する電力を最大値の７０％に変更する。 When the slide is not displayed after 1 minute has elapsed since the power was turned on (for example, when a video signal is not input or a predetermined still image is continuously input), the CPU circuit 24A The power supplied to the light source 11 is changed to 90% of the maximum value. If no slide is displayed until 3 minutes have passed, the CPU circuit 24A changes the power supplied to the light source 11 to 80% of the maximum value. Further, when no slide is displayed until 5 minutes have passed, the CPU circuit 24A changes the power supplied to the light source 11 to 70% of the maximum value.
　その後ＣＰＵ回路２４Ａは、映像信号の変化があるか否かの判断を繰り返し、映像信号の変化があった場合、電力を最大値１００％に変更する。 Thereafter, the CPU circuit 24A repeatedly determines whether or not there is a change in the video signal, and when there is a change in the video signal, changes the power to the maximum value of 100%.
　プレゼンテーションがスタートした後においても同様に、ＣＰＵ回路２４Ａは、映像信号の変化があったか否かを判断し、無変化継続時間に応じて、光源１１に供給する電力を変更する。これにより、光源１１に供給される電力は、スライドが切替わった時点から、無変化継続時間が１分未満である期間は最大値１００％となり、無変化継続時間が１分を超えると、無変化継続時間の長さに応じて徐々に低減される。 Similarly, after the presentation starts, the CPU circuit 24A determines whether or not the video signal has changed, and changes the power supplied to the light source 11 in accordance with the unchanged time duration. As a result, the power supplied to the light source 11 has a maximum value of 100% during the period in which the no-change duration is less than 1 minute from the time when the slide is switched, and no change occurs if the no-change duration exceeds 1 minute. It is gradually reduced according to the length of change duration.
　なお、スライド１，２，３，６を表示している状態では、無変化継続時間が５分以上であり、スライド４を表示している状態では、無変化継続時間が１分以上３分未満であり、スライド５を表示している状態では、無変化継続時間が３分以上５分未満であることを示している。 In the state where slides 1, 2, 3, and 6 are displayed, the unchanged duration is 5 minutes or more, and in the state where slide 4 is displayed, the unchanged duration is 1 minute or more and less than 3 minutes. In the state where the slide 5 is displayed, it is indicated that the non-change duration is 3 minutes or more and less than 5 minutes.
　なお図４において、比較例の電力を示す線とプロジェクタ１００Ａの電力を示す線とに挟まれた領域（斜線部）の面積は、プロジェクタ１００Ａが比較例と比べて低減された消費電力の大きさを示す。 In FIG. 4, the area of the region (shaded area) sandwiched between the line indicating the power of the comparative example and the line indicating the power of the projector 100A is the magnitude of the power consumption that the projector 100A has reduced compared to the comparative example. Indicates.
　以上説明したように、本実施形態によれば、映像信号処理回路２１が出力する画像の変化（画像が変化したか否か）の検出結果に基づいて、光源駆動回路２５が光源１１に供給する電力が調整される。これにより、映像信号の輝度が高い状態が続く場合であっても、消費電力を低減することが可能になる。 As described above, according to the present embodiment, the light source driving circuit 25 supplies the light source 11 based on the detection result of the change in the image output from the video signal processing circuit 21 (whether the image has changed). The power is adjusted. This makes it possible to reduce power consumption even when the luminance of the video signal continues to be high.
　また、本実施形態によれば、映像信号処理回路２１が出力する画像が変化していない無変化継続時間に応じて、電力が調整される。したがって、同じ画像が表示されている時間が長くなるほど、その画像に対する視聴者の注目度が低下していくことが多いため、注目度の低下に合わせて、光源１１に供給する電力を低下させることが可能になる。このため、光源１１に供給する電力が低下するほど、表示画面が暗くなるので、画像に対する注目度の低下に応じて画像を暗くすることが可能になり、画像の明るさが変化することで視聴者に与える影響を抑制することが可能になる。 Further, according to the present embodiment, the power is adjusted according to the non-change duration time during which the image output from the video signal processing circuit 21 has not changed. Therefore, as the time during which the same image is displayed becomes longer, the attention level of the viewer with respect to the image often decreases. Therefore, the power supplied to the light source 11 is reduced in accordance with the decrease in the attention level. Is possible. For this reason, as the power supplied to the light source 11 decreases, the display screen becomes darker. Therefore, it is possible to darken the image in accordance with a decrease in the degree of attention to the image, and viewing by changing the brightness of the image. It is possible to suppress the influence on the person.
　例えば、プレゼンテーション資料を表示する場合、表示されたスライドが注目されている時間は限られており、表示された画像が注目されていない期間には、画像の明るさが低下してもプレゼンテーションの視聴者に対する影響は少ない。そして表示するスライドが変化していない状態が継続するほど、表示されたスライドが注目されている可能性は低くなる。 For example, when presentation materials are displayed, the time during which the displayed slide is focused is limited, and during the period when the displayed image is not focused, the presentation can be viewed even if the brightness of the image decreases. The impact on the person is small. And the possibility that the displayed slide is attracting attention decreases as the state in which the slide to be displayed remains unchanged.
　より具体的には、一般的なプレゼンテーションの流れとしては、１枚ずつスライドを表示して、発表者が表示されたスライドの説明を行い、その後説明した内容について質疑応答やディスカッションが行われる場合が多い。このとき、視聴者は、発表者が説明を行っている間は、表示されたスライドに注目している可能性が高いが、その後質疑応答やディスカッションを行っている最中は表示されたスライドに注目していない可能性が高い。そして質疑応答やディスカッションを行っている最中は、表示されたスライドが変化しない場合が多い。 More specifically, as a general presentation flow, slides are displayed one by one, the presenter explains the displayed slide, and then a question-and-answer session or discussion is held on the contents explained. Many. At this time, it is highly likely that the viewer is paying attention to the displayed slide while the presenter is explaining, but during the subsequent question-and-answer session or discussion, It is likely that you have not paid attention. And during a question-and-answer session or discussion, the displayed slide often does not change.
　また、プレゼンテーション開始前の準備期間や、プレゼンテーション終了後の歓談中において、タイトル画像を表示させる場合がある。このタイトル画像の表示は、暗くても特に問題はない。 Also, the title image may be displayed during the preparation period before the presentation starts or during the chat after the presentation ends. There is no particular problem even if the title image is dark.
　したがって、上記のように画像が変化していない無変化継続時間に応じて光源１１に供給する電力を調整することで、表示される画像の明るさが変化することでプレゼンテーションの視聴者に与える影響を抑制しつつ、消費電力を低減することができる。 Therefore, by adjusting the power supplied to the light source 11 according to the non-change duration time during which the image has not changed as described above, the brightness of the displayed image changes, and the effect on the viewer of the presentation The power consumption can be reduced while suppressing the above.
　なお、本実施形態では、表示するスライドを切替えてから１分後に光源１１に供給する電力を低減することとした。これは、１枚のスライドを説明する時間は一般的に１分以内であることが望ましいと言われているためである。このように、光源１１に供給する電力を低減するタイミングは、スライドの説明、質疑応答、ディスカッションにかかる時間長などの予測に基づいて、設定されることが望ましい。 In this embodiment, the power supplied to the light source 11 is reduced 1 minute after switching the slide to be displayed. This is because it is generally said that the time for explaining one slide is preferably within one minute. As described above, it is desirable that the timing for reducing the power supplied to the light source 11 is set based on predictions such as explanation of the slide, question and answer, and the length of time required for discussion.
　また、本実施形態によれば、光源１１に供給する電力は、無変化継続時間が長いほど低減される。これにより、プレゼンテーション資料など表示する画像が変化していない状態が長く継続しているほど視聴者が表示された画像に注目している可能性が低下するコンテンツについて、画像の明るさが変化することで視聴者に与える影響を抑制することが可能になる。 Further, according to the present embodiment, the power supplied to the light source 11 is reduced as the non-change duration time is longer. As a result, the brightness of the image changes for content where the possibility that the viewer is paying attention to the displayed image decreases as the state of the image to be displayed, such as presentation material, has not changed for a long time. This makes it possible to suppress the influence on the viewer.
　また、本実施形態によれば、光源１１に供給する電力は、段階的に低減される。これにより、電力が最大値から直接最小値に切替えられる場合と比較して、視聴者が電力の低減による画像の明るさの変化を認識しづらくすることが可能になり、画像の明るさが変化することで視聴者に与える違和感を低減することが可能になる。また、光源１１に供給する電力は、画像が切り替わるタイミングに応じて、電力が低減される前の値（初期値）に調整されるので、画像の明るさが急に変化することによる視聴者に与える違和感を低減することが可能になる。 Moreover, according to this embodiment, the electric power supplied to the light source 11 is reduced in steps. This makes it more difficult for viewers to recognize changes in image brightness due to reduced power, compared to when the power is switched directly from the maximum value to the minimum value, and the brightness of the image changes. By doing so, it is possible to reduce the uncomfortable feeling given to the viewer. Further, the power supplied to the light source 11 is adjusted to a value (initial value) before the power is reduced according to the timing at which the image is switched. It is possible to reduce the uncomfortable feeling given.
　また、本実施形態によれば、映像信号をフレーム毎に比較して、映像信号の変化の有無を示す比較結果信号が生成され、この比較結果信号に基づいて画像の変化が検出される。これにより、実際に表示される画像が変化した時点をより正確に検出することができる。このため、確実に、表示された画像に視聴者が注目していない状態で、光源１１に供給する電力を低減することが可能になる。 Also, according to the present embodiment, the video signal is compared for each frame, a comparison result signal indicating whether or not the video signal has changed is generated, and a change in the image is detected based on the comparison result signal. Thereby, it is possible to more accurately detect the time point when the actually displayed image changes. For this reason, it is possible to reliably reduce the power supplied to the light source 11 while the viewer is not paying attention to the displayed image.
　具体的には、プレゼンテーション資料上にポインタを重畳して表示する場合には、ポインタが動いている間は画像が変化していると判断され、ポインタ操作を行わなくなってからの経過時間に応じて、電力が調整される。またプレゼンテーション資料にアニメーション表示の設定がされている場合、アニメーションが実行されている間は、画像が変化していると判断される。ポインタを動かしている場合や、アニメーションが実行されている間は、表示されたスライドの説明を行っている可能性が高く、視聴者が表示された画像に注目している可能性が高い。このような場合に光源１１に供給する電力が低減されて画像の明るさが低下することを抑制することが可能になる。 Specifically, when the pointer is superimposed on the presentation material, it is determined that the image is changing while the pointer is moving, and the time elapsed since the pointer operation was stopped is determined. The power is adjusted. When the animation display is set in the presentation material, it is determined that the image is changing while the animation is being executed. When the pointer is moved or while the animation is being executed, it is highly likely that the displayed slide is being explained, and there is a high possibility that the viewer is paying attention to the displayed image. In such a case, power supplied to the light source 11 is reduced, and it is possible to suppress a reduction in image brightness.
　（第２の実施形態）
　次に本発明の第２の実施形態について説明する。図５は、本発明の第２の実施形態にかかるプロジェクタの構成を示すブロック図である。 (Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 5 is a block diagram showing a configuration of a projector according to the second embodiment of the present invention.
　図５に示すプロジェクタ１００Ｂは、本発明の第１の実施形態にかかるプロジェクタ１００Ａと比較して、映像比較回路２３を有さず、さらに、ＣＰＵ回路２４Ａの代わりに、制御部として、ＰＣ２００Ｂが出力するスライド切替信号に基づいて光源１１に供給する電力を調整するＣＰＵ回路２４Ｂを有する。 The projector 100B shown in FIG. 5 does not have the video comparison circuit 23 as compared with the projector 100A according to the first embodiment of the present invention, and the PC 200B outputs as a control unit instead of the CPU circuit 24A. The CPU circuit 24B adjusts the power supplied to the light source 11 based on the slide switching signal.
　ＣＰＵ回路２４Ｂは、具体的には、ＰＣ２００Ｂが出力し、表示する画像を別の画像に切り替える旨のスライド切替信号を受け付け、このスライド切替信号に基づいて映像信号処理回路２１が出力する画像の変化を検出し、当該検出結果に基づいて、光源１１に供給する電力を示すコマンドを光源駆動回路２５に出力することで、光源１１に供給する電力を調整する。 Specifically, the CPU circuit 24B receives a slide switching signal output from the PC 200B to switch the image to be displayed to another image, and changes in the image output from the video signal processing circuit 21 based on the slide switching signal. , And a command indicating the power supplied to the light source 11 is output to the light source driving circuit 25 based on the detection result, thereby adjusting the power supplied to the light source 11.
　複数のスライドを含むプレゼンテーション資料を表示するアプリケーションを実行するＰＣ２００Ｂに対して、発表者が所定のスライド切替操作を行うと、表示するスライドが切替えられる。スライド切替信号は、表示されるスライドを別の画像に切り替えることを示す。本実施形態においてスライド切替信号は、２つの値のいずれかに対応するパルス信号とし、通常は、２つの値のうち大きい方の「Ｈｉ」の値をとり、スライドが切替えられるタイミングから所定の期間「Ｌｏ」の値をとるものとする。スライド切替信号が「Ｌｏ」の値をとる所定の期間とは、例えば、映像比較回路２３に入力される映像信号の１フレーム期間以下の期間である。なお、スライド切替のタイミングを検出することができればよいため、スライド切替信号は、スライドを切り替えるタイミングで出力される、所定のコマンドを含む制御信号でもよい。 When the presenter performs a predetermined slide switching operation on the PC 200B that executes an application that displays a presentation material including a plurality of slides, the slide to be displayed is switched. The slide switching signal indicates that the displayed slide is switched to another image. In this embodiment, the slide switching signal is a pulse signal corresponding to one of the two values, and usually takes the larger “Hi” value of the two values, and a predetermined period from the timing at which the slide is switched. The value “Lo” is assumed. The predetermined period in which the slide switching signal takes the value “Lo” is, for example, a period of one frame period or less of the video signal input to the video comparison circuit 23. Note that the slide switching signal may be a control signal including a predetermined command that is output at the timing of switching the slide, as long as the slide switching timing can be detected.
　図６は、プロジェクタ１００Ｂの動作例を説明するためのフローチャートである。なお、図示していないが、ＣＰＵ回路２４Ｂは、プロジェクタ１００Ｂの電源が投入されると、タイマーを動作させて無変化継続時間をカウントする。またＣＰＵ回路２４Ｂは、このときコマンドａを出力することで、光源１１に供給される電力を最大値１００％に設定する。 FIG. 6 is a flowchart for explaining an operation example of the projector 100B. Although not shown, when the power of the projector 100B is turned on, the CPU circuit 24B operates a timer to count the non-change duration time. At this time, the CPU circuit 24B outputs the command a to set the power supplied to the light source 11 to the maximum value of 100%.
　ＣＰＵ回路２４Ｂは、スライド切替信号を受信したか否かを判断する（ステップＳ２００）。そして、スライド切替信号を受信した場合、ＣＰＵ回路２４Ｂは、タイマーをリセットし、コマンドａを出力することで、光源１１の電力を最大値１００％に設定する（ステップＳ２０５）。 The CPU circuit 24B determines whether or not a slide switching signal has been received (step S200). When the slide switching signal is received, the CPU circuit 24B resets the timer and outputs the command a to set the power of the light source 11 to the maximum value 100% (step S205).
　ステップＳ２００でスライド切替信号を受信しない場合、およびステップＳ２０５の処理が終わった場合、ＣＰＵ回路２４Ｂは、光源１１に供給する電力を調整する電力調整処理を実行する（ステップＳ２１０）。なおステップＳ２１０の電力調整処理は、図３のステップＳ１１５からステップＳ１４５の処理に相当する。電力調整処理を実行すると、映像信号処理回路２１が出力する画像が変化しない無変化継続時間に応じて、光源１１に供給する電力が調整される。 When the slide switching signal is not received in step S200 and when the process of step S205 is completed, the CPU circuit 24B executes a power adjustment process for adjusting the power supplied to the light source 11 (step S210). Note that the power adjustment processing in step S210 corresponds to the processing from step S115 to step S145 in FIG. When the power adjustment process is executed, the power supplied to the light source 11 is adjusted according to the non-change duration time during which the image output from the video signal processing circuit 21 does not change.
　次にＣＰＵ回路２４Ｂは、プロジェクタ１００Ｂの電源がＯＦＦ状態とされたか否かを判断する（ステップＳ２１５）。そして電源がＯＦＦ状態とされていない場合、ＣＰＵ回路２４Ｂは、ステップＳ２００の処理を実行する。 Next, the CPU circuit 24B determines whether or not the power source of the projector 100B is turned off (step S215). If the power is not turned off, the CPU circuit 24B executes the process of step S200.
　以上説明したように、本実施形態によれば、ＰＣ２００Ｂから入力されたスライド切替信号に基づいて映像信号処理回路２１が出力する画像の変化が検出され、当該検出結果に基づいて、光源１１に供給する電力が調整される。これにより、プロジェクタ１００Ｂ側には映像比較回路２３が必要ないため、プロジェクタ１００Ｂの構成を簡略化することが可能になる。またスライド切替信号は、ＰＣ２００Ｂに対して、表示する画像を切替える切替操作が行われた時点を示す。このため、切替操作が行われた時点から映像信号処理回路２１が出力する画像が変化した時点を特定することができる。したがって、明確に切替操作が行われた時点からの経過時間に応じて光源１１に供給する電力が決定され、確実に表示するスライドを切替えた時点からの経過時間に応じて電力を決定することが可能になる。 As described above, according to the present embodiment, a change in the image output from the video signal processing circuit 21 is detected based on the slide switching signal input from the PC 200B, and supplied to the light source 11 based on the detection result. Power to be adjusted. Thereby, since the image comparison circuit 23 is not required on the projector 100B side, the configuration of the projector 100B can be simplified. The slide switching signal indicates a point in time when a switching operation for switching the image to be displayed is performed on the PC 200B. For this reason, it is possible to specify the time point when the image output from the video signal processing circuit 21 changes from the time point when the switching operation is performed. Therefore, the power to be supplied to the light source 11 is determined according to the elapsed time from when the switching operation is clearly performed, and the power can be determined according to the elapsed time from the time when the slide to be displayed is switched reliably. It becomes possible.
　（第３の実施形態）
　次に本発明の第３の実施形態について説明する。図７は、本発明の第３の実施形態にかかるプロジェクタの構成を示すブロック図である。 (Third embodiment)
Next, a third embodiment of the present invention will be described. FIG. 7 is a block diagram showing a configuration of a projector according to the third embodiment of the present invention.
　図７に示すプロジェクタ１００Ｃは、本発明の第２の実施形態にかかるプロジェクタ１００Ｂと比較して、スライド切替信号に基づいて画像の変化を検出するＣＰＵ回路２４Ｂの代わりに、ＰＣ２００Ｃが決定した電力値を受け付け、受け付けた電力値に基づいて光源１１に供給する電力を調整するＣＰＵ回路２４Ｃを有する。 The projector 100C shown in FIG. 7 is different from the projector 100B according to the second embodiment of the present invention in that the power value determined by the PC 200C is used instead of the CPU circuit 24B that detects the image change based on the slide switching signal. And a CPU circuit 24C that adjusts the power supplied to the light source 11 based on the received power value.
　ＣＰＵ回路２４Ｃは、ＰＣ２００Ｃが出力する電力値を受け付け、受け付けた電力値に基づいて光源１１に供給する電力を調整する。具体的には、ＣＰＵ回路２４Ｃは、ＰＣ２００Ｃから受け付けた電力値を示すコマンドを光源駆動回路２５に入力する。 The CPU circuit 24C receives the power value output from the PC 200C and adjusts the power supplied to the light source 11 based on the received power value. Specifically, the CPU circuit 24 </ b> C inputs a command indicating the power value received from the PC 200 </ b> C to the light source driving circuit 25.
　このようにプロジェクタ１００Ｃは、プロジェクタ１００Ｃの外部から入力された電力値に従って、光源１１に供給される電力を調整するものであり、プロジェクタ１００ＡおよびＢと異なり、光源１１に供給する電力を決定する構成を有さない。 Thus, the projector 100C adjusts the power supplied to the light source 11 according to the power value input from the outside of the projector 100C. Unlike the projectors 100A and 100B, the projector 100C determines the power supplied to the light source 11. Does not have.
　図８は、プロジェクタ１００Ｃと接続されたＰＣ２００Ｃの構成を示すブロック図である。図８に示すＰＣ２００Ｃは、プロジェクタ１００Ｃの光源１１に供給する電力値を決定する機能を有する。 FIG. 8 is a block diagram showing a configuration of the PC 200C connected to the projector 100C. The PC 200C shown in FIG. 8 has a function of determining a power value supplied to the light source 11 of the projector 100C.
　ＰＣ２００Ｃは、出力部２０１と、操作部２０２と、アプリケーション制御部２０３とを有する。 The PC 200C includes an output unit 201, an operation unit 202, and an application control unit 203.
　出力部２０１は、プロジェクタ１００Ｃに映像信号および電力値を出力するインタフェースである。出力部２０１は、有線または無線でプロジェクタ１００Ｃと接続する。 The output unit 201 is an interface that outputs a video signal and a power value to the projector 100C. The output unit 201 is connected to the projector 100C by wire or wireless.
　操作部２０２は、ユーザからの操作に応じてＰＣ２００Ｃに情報を入力する。操作部２０２は、例えばマウス、タッチパネル、キーボード、ボタン、マイク、スイッチ、およびレバーなどである。本実施形態においては、操作部２０２は、プレゼンテーション資料に含まれるスライドのうち、表示するスライドを切替える切替操作を受け付ける。操作部２０２は、ユーザの操作に応じた操作信号を生成してアプリケーション制御部２０３に入力する。 The operation unit 202 inputs information to the PC 200C according to an operation from the user. The operation unit 202 is, for example, a mouse, a touch panel, a keyboard, a button, a microphone, a switch, and a lever. In the present embodiment, the operation unit 202 receives a switching operation for switching the slide to be displayed among the slides included in the presentation material. The operation unit 202 generates an operation signal corresponding to a user operation and inputs the operation signal to the application control unit 203.
　アプリケーション制御部２０３は、複数のスライドを含むプレゼンテーション資料を作成および表示する。具体的には、アプリケーション制御部２０３は、例えばＣＰＵ回路などの制御装置であり、図示しないメモリに記憶されたプログラムを読み取り、このプログラムを実行することで以下の機能を有する映像信号生成部２０４、スライド切替信号生成部２０５、および光源電力制御部２０６を実現する。 The application control unit 203 creates and displays presentation materials including a plurality of slides. Specifically, the application control unit 203 is a control device such as a CPU circuit, for example, and reads a program stored in a memory (not shown) and executes the program to generate a video signal generation unit 204 having the following functions. A slide switching signal generation unit 205 and a light source power control unit 206 are realized.
　映像信号生成部２０４は、プレゼンテーション資料の内容を示す映像信号を生成する。 The video signal generation unit 204 generates a video signal indicating the contents of the presentation material.
　スライド切替信号生成部２０５は、操作部２０２から入力される操作信号に基づいて、表示する画像を変化させる操作が行われた旨のスライド切替信号を生成して出力する。 The slide switching signal generation unit 205 generates and outputs a slide switching signal indicating that an operation for changing an image to be displayed is performed based on the operation signal input from the operation unit 202.
　光源電力制御部２０６は、ＰＣ２００Ｃと接続されたプロジェクタ１００Ｃの光源１１に供給される電力を決定し、決定した電力を光源１１に供給する旨の供給指示を、出力部２０１を介して表示装置１００Ｃに入力する。具体的には、光源電力制御部２０６は、スライド切替信号生成部２０５が出力したスライド切替信号を受け付け、このスライド切替信号に基づいて映像信号処理回路２１が出力する画像の変化を検出し、光源１１に供給する電力値を決定する。より具体的には、光源電力制御部２０６は、画像が変化しない無変化継続時間に応じて、光源１１に供給する電力を低減する。 The light source power control unit 206 determines the power to be supplied to the light source 11 of the projector 100C connected to the PC 200C, and supplies a display instruction for supplying the determined power to the light source 11 via the output unit 201. To enter. Specifically, the light source power control unit 206 receives the slide switching signal output from the slide switching signal generation unit 205, detects a change in the image output from the video signal processing circuit 21 based on the slide switching signal, and 11 determines the power value to be supplied to 11. More specifically, the light source power control unit 206 reduces the power supplied to the light source 11 according to the non-change duration time during which the image does not change.
　図９は、ＰＣ２００Ｃの動作例を説明するためのフローチャートである。 FIG. 9 is a flowchart for explaining an operation example of the PC 200C.
　光源電力制御部２０６は、スライド切替信号生成部２０５からスライド切替信号を受信したか否かを判断する（ステップＳ３００）。そしてスライド切替信号を受信した場合、光源電力制御部２０６は、タイマーをリセットする（ステップＳ３０５）。 The light source power control unit 206 determines whether or not a slide switching signal has been received from the slide switching signal generation unit 205 (step S300). When the slide switching signal is received, the light source power control unit 206 resets the timer (step S305).
　スライド切替信号を受信しなかった場合、およびステップＳ３０５の処理が終わった場合、光源電力制御部２０６は、光源１１に供給する電力値を決定する電力決定処理を実行する（ステップＳ３１０）。なおステップＳ３１０の電力決定処理は、図３のステップＳ１１５からステップＳ１４０の処理に相当する。電力決定処理を実行すると、無変化継続時間に応じて、光源１１に供給する電力が決定される。 When the slide switching signal is not received and when the process of step S305 is completed, the light source power control unit 206 executes a power determination process for determining a power value to be supplied to the light source 11 (step S310). The power determination process in step S310 corresponds to the process from step S115 to step S140 in FIG. When the power determination process is executed, the power to be supplied to the light source 11 is determined according to the non-change duration time.
　次に光源電力制御部２０６は、決定した電力値をプロジェクタ１００Ｃに向けて出力する（ステップＳ３１５）。そして光源電力制御部２０６は、プロジェクタ１００Ｃの電源がＯＦＦ状態とされたか否かを判断する（ステップＳ３２０）。そして電源がＯＦＦ状態とされていない場合、光源電力制御部２０６は、ステップＳ３００の処理を再び実行する。 Next, the light source power control unit 206 outputs the determined power value to the projector 100C (step S315). Then, the light source power control unit 206 determines whether or not the power source of the projector 100C has been turned off (step S320). If the power is not turned off, the light source power control unit 206 executes the process of step S300 again.
　以上説明したように、本実施形態によれば、プロジェクタ１００Ｃと異なる情報処理装置であるＰＣ２００Ｃにおいて、プロジェクタ１００Ｃの光源１１に供給する電力が決定される。これにより、プロジェクタ１００Ｃの構成に大きな変更を加えることなく、プロジェクタ１００Ｃの消費電力を低減することが可能になる。 As described above, according to the present embodiment, the power to be supplied to the light source 11 of the projector 100C is determined in the PC 200C that is an information processing apparatus different from the projector 100C. As a result, it is possible to reduce the power consumption of the projector 100C without greatly changing the configuration of the projector 100C.
　（第４の実施形態）
　次に本発明の第４の実施形態について説明する。図１０は、本発明の第４の実施形態にかかるプロジェクタの構成を示すブロック図である。本発明の第１～第３の実施形態においては、プロジェクタ１００Ａ，１００Ｂ，１００Ｃは、それぞれＰＣ２００Ａ，２００Ｂ，２００Ｃから入力された映像信号に応じた画像を表示したのに対して、本実施形態にかかるプロジェクタ１００Ｄは、内蔵された記憶回路に記憶された画像データに応じた画像を表示する。 (Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. FIG. 10 is a block diagram showing a configuration of a projector according to the fourth embodiment of the present invention. In the first to third embodiments of the present invention, projectors 100A, 100B, and 100C display images corresponding to video signals input from PCs 200A, 200B, and 200C, respectively. The projector 100D displays an image corresponding to the image data stored in the built-in storage circuit.
　プロジェクタ１００Ｄは、本発明の第１の実施形態にかかるプロジェクタ１００Ａと比較して、操作検出部２７および記憶回路２８をさらに有する。 The projector 100D further includes an operation detection unit 27 and a storage circuit 28 as compared with the projector 100A according to the first embodiment of the present invention.
　操作検出部２７は、リモートコントローラなどの入力部に対して、所定の操作が行われた場合に、操作に応じて生成される制御信号を受け付ける受信部であり、受け付けた制御信号をＣＰＵ回路２４Ｄに出力する。操作検出部２７は、例えば、制御信号として、表示する画像を別の画像に切り替えるように指示するスライド切替指示信号をＣＰＵ回路２４Ｄに出力する。また操作検出部２７は、入力部を操作することで指定された表示画像上のポインタ位置を検出してＣＰＵ回路２４Ｄに出力する。 The operation detection unit 27 is a reception unit that receives a control signal generated according to an operation when a predetermined operation is performed on an input unit such as a remote controller, and the received control signal is transmitted to the CPU circuit 24D. Output to. For example, the operation detection unit 27 outputs, as a control signal, a slide switching instruction signal that instructs to switch an image to be displayed to another image to the CPU circuit 24D. The operation detection unit 27 detects the pointer position on the display image designated by operating the input unit, and outputs the detected pointer position to the CPU circuit 24D.
　記憶回路２８は、例えばプレゼンテーション資料の各スライドに対応する画像データを格納する記憶部である。 The storage circuit 28 is a storage unit that stores image data corresponding to each slide of the presentation material, for example.
　ＣＰＵ回路２４Ｄは、ＣＰＵ回路２４Ａが行う処理に加えて、操作検出部２７から入力されるスライド切替指示信号に応じて、記憶回路２８から画像を読み込んで映像信号処理回路２１に入力する処理と、操作検出部２７から入力されるポインタ位置に応じて映像信号処理回路２１にポインタを重畳して表示させる処理とを行う。 In addition to the processing performed by the CPU circuit 24A, the CPU circuit 24D reads the image from the storage circuit 28 and inputs it to the video signal processing circuit 21 in accordance with the slide switching instruction signal input from the operation detection unit 27. In accordance with the pointer position input from the operation detection unit 27, the video signal processing circuit 21 performs processing for superimposing and displaying the pointer.
　例えば、操作検出部２７からスライド切替指示信号が入力されると、ＣＰＵ回路２４Ｄは、記憶回路２８から、スライド切替指示信号により指定されたスライドに対応する画像の映像信号を読み込み、映像信号処理回路２１に出力する。また、操作検出部２７からポインタ位置が入力されると、ＣＰＵ２４Ｄは、ポインタ位置を映像信号処理回路２１に出力する。 For example, when a slide switching instruction signal is input from the operation detection unit 27, the CPU circuit 24D reads the video signal of the image corresponding to the slide designated by the slide switching instruction signal from the storage circuit 28, and the video signal processing circuit To 21. Further, when the pointer position is input from the operation detection unit 27, the CPU 24 </ b> D outputs the pointer position to the video signal processing circuit 21.
　映像信号処理回路２１は、ＣＰＵ２４Ｄから出力された映像信号に各種の処理を施す。このとき、映像信号処理回路２１は、ＯＳＤ処理を利用してスライド上にポインタを重畳する。ポインタを重畳するＯＳＤ処理を行う場合、映像信号処理回路２１は、ＯＳＤ処理後の画像を映像比較回路２３に出力することが望ましい。 The video signal processing circuit 21 performs various processes on the video signal output from the CPU 24D. At this time, the video signal processing circuit 21 superimposes a pointer on the slide using OSD processing. When performing the OSD process for superimposing the pointer, the video signal processing circuit 21 preferably outputs the image after the OSD process to the video comparison circuit 23.
　なお、本実施形態の電力調整処理は、図３で示した処理と同様であるため、ここでは説明を省略する。 In addition, since the power adjustment process of this embodiment is the same as the process shown in FIG. 3, description is abbreviate | omitted here.
　なお、本実施形態では、スライドに対応する画像データを記憶する記憶回路を有するプロジェクタの一例として、映像比較回路２３を有するプロジェクタ１００Ｄを示したが、画像の変化を検出する処理は、第２の実施形態のように、スライド切替指示信号に基づいて検出してもよい。この場合、ＣＰＵ２４Ｄは、スライド切替指示信号が出力された場合に加えて、操作検出部２７が検出するポインタ位置が変化した場合にも画像が変化したと判断することができる。 In the present embodiment, the projector 100D having the video comparison circuit 23 is shown as an example of the projector having the storage circuit that stores the image data corresponding to the slide. You may detect based on a slide switching instruction | indication signal like embodiment. In this case, the CPU 24D can determine that the image has changed when the pointer position detected by the operation detection unit 27 changes in addition to when the slide switching instruction signal is output.
　また、本実施形態では、記憶回路を内蔵するプロジェクタ１００Ｄについて説明したが、本発明はかかる例に限定されない。記憶回路は、例えばＵＳＢ（Ｕｎｉｖｅｒｓａｌ　Ｓｅｒｉａｌ　Ｂｕｓ）メモリなどの外部装置であってもよい。この場合、プロジェクタは、ＵＳＢコネクタなどの外部接続端子を有し、この外部接続端子を介して接続された外部装置の記憶回路に記憶された画像データを読み込んで表示する。 In the present embodiment, the projector 100D having a built-in storage circuit has been described, but the present invention is not limited to such an example. The storage circuit may be an external device such as a USB (Universal Serial Bus) memory. In this case, the projector has an external connection terminal such as a USB connector, and reads and displays the image data stored in the storage circuit of the external device connected via the external connection terminal.
　以上、実施形態を参照して本願発明を説明したが、本願発明は上記実施形態に限定されるものではない。本願発明の構成や詳細には、本願発明のスコープ内で当業者が理解し得る様々な変更をすることができる。 The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.
　例えば、上記実施形態では、電力は、無変化継続時間に応じて段階的に低減されることとしたが、本発明はかかる例に限定されない。例えば電力は、連続的に低減されてもよい。 For example, in the above embodiment, the power is reduced stepwise according to the non-change duration, but the present invention is not limited to such an example. For example, the power may be continuously reduced.
　また上記実施形態では、電力を最大値の７０％～１００％の範囲で変化させることとしたが、本発明はかかる例に限定されない。光源の種類などに応じて、無変化継続時間と電力との対応関係を適宜変更することが可能である。 In the above embodiment, the electric power is changed in the range of 70% to 100% of the maximum value, but the present invention is not limited to such an example. Depending on the type of light source and the like, it is possible to appropriately change the correspondence between the non-change duration and the power.
　また上記実施形態では、表示素子の一例であるＤＭＤ１５を用いたプロジェクタを例示したが、本発明はかかる例に限定されない。表示素子は、ＤＭＤ１５に限らず、液晶パネルなど他の表示素子が用いられてもよい。なお他の表示素子が用いられる場合、例えば、ＤＭＤ駆動回路２２に代えて、表示素子に合わせた駆動回路が用いられる。表示素子が液晶表示素子である場合、駆動回路としてＬＣＤ（Ｌｉｑｕｉｄ　Ｃｒｙｓｔａｌ　Ｄｉｓｐｌａｙ）駆動回路が用いられる。 In the above embodiment, the projector using the DMD 15 which is an example of the display element is illustrated, but the present invention is not limited to such an example. The display element is not limited to the DMD 15 and other display elements such as a liquid crystal panel may be used. When other display elements are used, for example, instead of the DMD drive circuit 22, a drive circuit corresponding to the display element is used. When the display element is a liquid crystal display element, an LCD (Liquid Crystal Display) drive circuit is used as the drive circuit.
　また上記実施形態では、表示装置の一例としてフロントプロジェクタを示したが、本発明はかかる例に限定されない。表示装置は、光源が出射した光を用いて画像を表示する装置であればよい。例えば、光源が出射した光を用いて画像を表示する装置の他の一例としては、リアプロジェクタ、透過型液晶表示装置、および反射型液晶表示装置などが挙げられる。 In the above embodiment, the front projector is shown as an example of the display device, but the present invention is not limited to such an example. The display device may be any device that displays an image using light emitted from a light source. For example, other examples of a device that displays an image using light emitted from a light source include a rear projector, a transmissive liquid crystal display device, and a reflective liquid crystal display device.
　また上記実施形態では、表示装置の光源に供給する電力を決定する情報処理装置の一例としてＰＣを例示したが、本発明はかかる例に限定されない。情報処理装置は、表示装置と有線または無線で接続して、表示装置に対して映像信号を入力することができる装置であればよい。 In the above embodiment, the PC is illustrated as an example of the information processing apparatus that determines the power supplied to the light source of the display device, but the present invention is not limited to such an example. The information processing device may be any device that can be connected to the display device in a wired or wireless manner and can input a video signal to the display device.
１００，１１０　　プロジェクタ
１１　　　　　　　光源
１２　　　　　　　カラーホイール
１３　　　　　　　照明光学系
１４　　　　　　　ミラー
１５　　　　　　　ＤＭＤ
１６　　　　　　　投写レンズ
２１　　　　　　　映像信号処理回路
２２　　　　　　　ＤＭＤ駆動回路
２３　　　　　　　映像比較回路
２４　　　　　　　ＣＰＵ回路（制御部）
２５　　　　　　　光源駆動回路
２６　　　　　　　カラーホイール駆動回路
２００　　　　　　ＰＣ（情報処理装置）
２０１　　　　　　出力部
２０２　　　　　　操作部
２０３　　　　　　アプリケーション制御部
２０４　　　　　　映像信号生成部
２０５　　　　　　スライド切替信号生成部
２０６　　　　　　光源電力制御部
３００　　　　　　スクリーン 100, 110 Projector 11 Light source 12 Color wheel 13 Illumination optical system 14 Mirror 15 DMD
16 Projection lens 21 Image signal processing circuit 22 DMD drive circuit 23 Image comparison circuit 24 CPU circuit (control unit)
25 Light source drive circuit 26 Color wheel drive circuit 200 PC (information processing apparatus)
201 Output unit 202 Operation unit 203 Application control unit 204 Video signal generation unit 205 Slide switching signal generation unit 206 Light source power control unit 300 Screen

Claims (9)

  1. 　光源と、
    　前記光源に電力を供給して、前記光源から光を出射させる光源駆動部と、
    　前記光源が出射した光を用いて画像を表示する表示素子と、
    　入力された映像信号に応じて前記表示素子が表示する画像を生成する映像信号処理部と、
    　前記映像信号処理部が出力する画像の変化を検出し、当該検出結果に基づいて、前記光源駆動部が前記光源に供給する電力を調整する制御部と、を備える表示装置。     A light source;
    A light source driving unit that supplies power to the light source and emits light from the light source;
    A display element for displaying an image using light emitted from the light source;
    A video signal processing unit that generates an image to be displayed by the display element according to the input video signal;
    A display device comprising: a control unit that detects a change in an image output from the video signal processing unit and adjusts power supplied from the light source driving unit to the light source based on the detection result.
  2. 　前記制御部は、前記映像信号処理部が出力する画像が変化していない無変化継続時間に応じて、前記電力を調整する、請求項１に記載の表示装置。 The display device according to claim 1, wherein the control unit adjusts the power according to a non-change duration time during which an image output from the video signal processing unit has not changed.
  3. 　前記制御部は、前記無変化継続時間が長いほど、前記電力を低減する、請求項２に記載の表示装置。 The display device according to claim 2, wherein the control unit reduces the power as the non-change duration time is longer.
  4. 　前記制御部は、前記電力を段階的に低減する、請求項３に記載の表示装置。 The display device according to claim 3, wherein the control unit reduces the electric power stepwise.
  5. 　前記映像信号をフレームごとに比較して、当該比較結果を示す比較結果信号を出力する画像比較部、をさらに備え、
    　前記制御部は、前記比較結果信号に基づいて前記映像信号処理部が出力する画像の変化を検出する、請求項１ないし４のいずれか１項に記載の表示装置。     An image comparison unit that compares the video signal for each frame and outputs a comparison result signal indicating the comparison result;
    The display device according to claim 1, wherein the control unit detects a change in an image output from the video signal processing unit based on the comparison result signal.
  6. 　前記映像信号処理部が前記画像比較部に出力する画像は、前記映像信号処理部に入力された画像である、請求項５に記載の表示装置。 The display device according to claim 5, wherein the image output from the video signal processing unit to the image comparison unit is an image input to the video signal processing unit.
  7. 　前記制御部は、前記映像信号を入力する外部装置から入力された、前記画像を別の画像に切り替える旨の切替信号に基づいて、前記画像の変化を検出する、請求項１ないし６のいずれか１項に記載の表示装置。 7. The control unit according to claim 1, wherein the control unit detects a change in the image based on a switching signal input from an external device that inputs the video signal to switch the image to another image. Item 1. A display device according to item 1.
  8. 　入力された映像信号に応じた画像を光源から出射された光を用いて表示する表示装置と接続される出力部と、
    　前記画像の変化を検出し、当該検出結果に基づいて、前記光源に供給する電力を決定し、当該決定した電力を前記光源に供給する旨の供給指示を、前記出力部を介して前記表示装置に入力する制御部と、を備える情報処理装置。     An output unit connected to a display device that displays an image corresponding to the input video signal using light emitted from the light source;
    The display device detects a change in the image, determines power to be supplied to the light source based on the detection result, and supplies a supply instruction to supply the determined power to the light source via the output unit. And an information processing apparatus comprising:
  9. 　光源と、前記光源に電力を供給して前記光源から光を出射させる光源駆動部と、前記光源が出射する光を用いて画像を表示する表示素子と、を有する表示装置の制御方法であって、
    　前記画像の変化を検出し、
    　前記検出結果に基づいて、前記光源駆動部が前記光源に供給する電力を調整する、表示装置の制御方法。
          A control method for a display device, comprising: a light source; a light source driving unit that supplies power to the light source to emit light from the light source; and a display element that displays an image using light emitted from the light source. ,
    Detecting a change in the image;
    A control method for a display device, wherein the power supplied from the light source driving unit to the light source is adjusted based on the detection result.
PCT/JP2012/081256 2012-12-03 2012-12-03 Display device, information processing device, and method for controlling display device WO2014087463A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2012/081256 WO2014087463A1 (en) 2012-12-03 2012-12-03 Display device, information processing device, and method for controlling display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2012/081256 WO2014087463A1 (en) 2012-12-03 2012-12-03 Display device, information processing device, and method for controlling display device

Publications (1)

Publication Number Publication Date
WO2014087463A1 true WO2014087463A1 (en) 2014-06-12

Family

ID=50882916

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2012/081256 WO2014087463A1 (en) 2012-12-03 2012-12-03 Display device, information processing device, and method for controlling display device

Country Status (1)

Country Link
WO (1) WO2014087463A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05188869A (en) * 1992-01-14 1993-07-30 Sharp Corp Portable information processor
JPH07193998A (en) * 1993-12-28 1995-07-28 Canon Inc Display
JP2008026349A (en) * 2006-07-18 2008-02-07 Seiko Epson Corp Display device
JP2009122310A (en) * 2007-11-14 2009-06-04 Seiko Epson Corp Display, display system, program and control method
JP2009204920A (en) * 2008-02-28 2009-09-10 Seiko Epson Corp Display device and program

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05188869A (en) * 1992-01-14 1993-07-30 Sharp Corp Portable information processor
JPH07193998A (en) * 1993-12-28 1995-07-28 Canon Inc Display
JP2008026349A (en) * 2006-07-18 2008-02-07 Seiko Epson Corp Display device
JP2009122310A (en) * 2007-11-14 2009-06-04 Seiko Epson Corp Display, display system, program and control method
JP2009204920A (en) * 2008-02-28 2009-09-10 Seiko Epson Corp Display device and program

Similar Documents

Publication Publication Date Title
EP1884705A1 (en) Light source device
JP5682417B2 (en) Head mounted display and its brightness adjustment method
JP6282601B2 (en) Display device
JP5861324B2 (en) Projector and projector control method
EP2447772B1 (en) Projection-type display device and control method for the same
JP2009003097A (en) Projection device, operation control method for projection device, and program
US9300905B2 (en) Projector, projector control method, and recording medium storing projector control program
US20100110024A1 (en) Method for providing user interface using dmd and dlp display apparatus using the method
US20180098039A1 (en) Projection apparatus and control method thereof
WO2014087463A1 (en) Display device, information processing device, and method for controlling display device
JP2019128590A (en) Image projection device
JP5716802B2 (en) Projection apparatus, projection method, and program
JP5375115B2 (en) Projection apparatus, projection method, and program
JP2007132984A (en) Display apparatus, program, information memory medium and on-screen display image display method
US10764546B2 (en) Projection device and method for generating adjustment gridlines
KR100686147B1 (en) Apparatus and Method for controling light screen of projection display system
JP5293574B2 (en) Video display device and television
WO2012023195A1 (en) Projection type display device and control method thereof
JP6137298B2 (en) Projector and projector control method
JP6137299B2 (en) Projector and projector control method
JP5459569B2 (en) Display control apparatus and display control method
JP2008058627A (en) Projector and projection system
JP2009204920A (en) Display device and program
KR20030087478A (en) Method for control light screen of projection display system
JP2013061498A (en) Image display device and image display method

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12889634

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12889634

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP